Jeff Cooper spent his entire career telling the world that the .45 ACP was the gold standard for a fighting handgun. Then in 1983, he designed a cartridge specifically to replace it. More velocity, more energy, more range. The 10 mm Auto was supposed to make the .45 obsolete. 40 years later, the .
45 ACP is chambered in more guns, loaded by more manufacturers, and sitting on more shelves than the 10 mm ever touched. The cartridge that was designed to kill the .45 couldn’t even outsell it. That should tell you something. But what it tells you depends on which question you’re actually asking. And most people are asking the wrong one.
Which one hits harder? The 10 mm. That’s not a debate. A full power 200 grain load from Underwood or Buffalo Bore runs about 1,200 ft per second. >> [clears throat] >> Over 630 ft lbs of energy from a semi-automatic handgun. That’s .41 magnum territory without a cylinder. The .45 in a standard 230 grain load runs 830 to 850.
370 to 400 ft lbs. 200 ft lbs less per trigger pull. If energy is the only question, the 10 mm wins, and this is a short video. It’s not the only question. Quick ground rule. Most factory 10 mm loads chronograph well below what the box says. So, this comparison only uses the 10 mm at its best, and the .45 at its best.
Both running full power. No sandbagging. Even at full power, the .45 does three things the 10 mm can’t match. And the 10 [music] mm does one thing the 45 will never touch. That one thing should decide this for you, but it comes later. First, the thing the 45 does that no energy number captures. When a 45 ACP Federal HST expands 230 grain, it opens to .97 inches.
Nearly a full inch of expanded bullet. That’s a projectile that started at 4.5 2000ths and nearly doubled its diameter inside tissue. The 10 mm’s best expansion from the same gel testing, .81 inches. And that was a lightweight 155 grain load running hot. The heavier 180 grain loads most people actually carry, smaller consistently.
A .97 inch wound channel versus a .81 inch wound channel. That’s not a rounding error. That’s 20% more tissue disruption. 20% more damage from the round that supposedly lost the energy debate. And when a hollow point clogs, and it happens more than anyone in the industry wants to talk about, the 45’s unexpanded diameter is still 4.
5 2000ths versus the 10 mm’s 4.000 1000ths. 12% wider on its worst day. The 45 doesn’t need to expand to outperform a 10 mm that didn’t expand either. Subscribe if you haven’t. Now, the section that changes this entire debate, and it has nothing to do with gel blocks. Thread a suppressor onto a 45. Standard 230 grain hardball at 830 ft per second.
The speed of sound at sea level is about 1125. That round is subsonic. Every factory .45 ACP load on the market is subsonic. You don’t need special ammunition. You don’t need to download anything. You don’t need to change your zero. The ammo in your nightstand magazine right now will work suppressed. Now thread a suppressor onto a 10 mm.
The entire point of the 10 mm is velocity. 1200 ft per second, 1300, 1400 from the hot stuff. Every one of those loads is supersonic. Thread a can onto it and you still get the crack. The suppressor kills the muzzle blast, but the bullet breaks the sound barrier and announces itself to everyone in earshot. You can buy subsonic 10 mm.
200 grain loads downloaded to 900 ft per second. They exist, but think about what you just did. You took the 10 mm only real advantage, velocity, and threw it away. A 200 grain 10 mm at 900 ft per second has less energy than a 230 grain .45 at 830. Less mass, smaller diameter, same speed range.
You turned a 10 mm into a worse .45. The .45 ACP was designed in 1905 to be slow and heavy. That wasn’t a limitation. That was the blueprint. And 120 years later, that blueprint is the reason it’s the best suppressor ready handgun cartridge [music] that exists. No modifications, no specialty ammo, no compromises. The 10 mm was designed to be fast.
Suppress it and you take away the one thing it does better than everything else. If you own a suppressor or plan to own one, >> [music] >> that’s the whole debate right there. But if you don’t suppress and you want raw power for a specific job, here’s where the 10-mm earns what it costs. The Danish military’s Sirius Patrol.
Two-man dog sled teams running Northeast Greenland for 4 months at a time. Temperatures below minus 40. No resupply. No backup. Polar bears that weigh over 1,000 lb and can outrun a dog team on flat ice. Their primary weapon is a rifle. Their sidearm is a Glock 20 in 10-mm. Not because the Glock 20 is the ideal bear gun, because it’s the most practical one.
15 rounds, semi-automatic, light enough to ride on a sled for 4 months without weighing down the gear. Full power hardcast 10-mm drives through heavy bone and dense muscle at depths the .45 cannot reach from a bad angle. [music] When [snorts] a polar bear is on top of you and the rifle is under the sled, 15 rounds of deep penetrating 10-mm is the difference.
The .45 cannot do this job. It doesn’t penetrate deep enough at its velocity to reliably reach vitals through heavy bone at an oblique angle on a large animal. That’s not an opinion. That’s what the penetration data says and that’s what the guys who bet their lives on it chose. If you live or work in bear country, the 10-mm is the answer and the conversation is over.
If you don’t, keep watching because the .45 has one more move that most people don’t even know exists. The .45 Super. Same case dimensions as .45 ACP, same bullet diameter, same overall length. But loaded to around 28,000 PSI compared to the .45 ACP’s mains 21,000, a .45 Super pushing a 185 grain bullet at 1,200 ft per second generates nearly 600 ft lbs of energy.
That’s 10 mm territory from a .45 platform with a wider bullet. What you need to run it, a stronger recoil spring and a supported barrel. Many aftermarket .45 barrels already handle it. Frame does not change. Magazines do not change. Holster does not change. The .460 Rowland takes it further. Same principle.
230 grains at 1,150 ft per second. Over 670 ft lbs. That matches the hottest 10 mm loads with a bullet that’s 50,000 wider. Neither round caught on with the mainstream market. Limited factory options. You are reloading or ordering online. That’s a real limitation. But the physics do not care about marketing. The .
45 ACP platform can reach up to 10 mm power levels. The 10 mm platform cannot cannot reach down to .45 ACP diameter. That equation runs one direction and no amount of velocity changes it. What are you carrying in the woods? What’s on your nightstand? 10 mm, .45, or something else entirely? Drop it [music] in the comments. Subscribe if you have not.
Now, availability. Because this is the part that separates these two calibers more than any ballistic test. .45 ACP has been in continuous production for 120 years. Every manufacturer loads it. Every retailer stocks it. Every gun shop in every state in America has it on the shelf right now. During the 2020 shortage, .
45 was one of the last handgun calibers to disappear and one of the first to return. 120 years of production infrastructure doesn’t vanish overnight. 10 mm is growing. More popular than it’s been in decades. But it’s still niche. During the same shortage, 10 mm vanished early and came back late. Fewer manufacturers, fewer retailers stocking depth.
If your plan depends on finding ammunition on a shelf when the supply chain is under stress, the .45 is the safer foundation and it’s not close. When 21,000 PSI versus 37,500. That gap isn’t just about recoil feel. Lower pressure means less stress on the barrel, the slide, the locking surfaces, and the frame.
A 1911 in .45 that was maintained [music] properly can go 50,000 rounds and still lock up tight. Run that same round count in full power 10 mm through a polymer frame and you’ll be replacing parts. The .45 was built to last because the cartridge was designed not to punish the gun that fires it. 120 years of service life proves the point.
Now, one more play. A Glock 21 in .45 accepts a 10 mm slide swap. Same frame, different slide, different barrel, different magazines. One gun that fires both calibers. .45 for home defense, suppressed, subsonic, quiet. No specialty ammo needed. 10 mm for the woods, full power, deep penetration. The quietest suppressed option and the most powerful semi-auto woods option from the same frame. That’s not a compromise.
That’s a system. So, what’s the verdict? The 10 mm is the better woods gun. Full stop. 15 rounds of hard cast at 1,200 ft per second in a semi-automatic. If you spend real time where large animals can kill you, the 10 mm earns every penny and every bit of recoil. The .45 ACP is the better everything else gun.
Wider expansion, better suppressor host, deeper ammo availability, lower pressure on the gun. 100 years 20 years of continuous production and nobody has managed to replace it. Not Jeff Cooper, not the FBI, not the internet. Cooper gave the 10 mm more velocity, more energy, and more range. What he couldn’t give it was more diameter, more availability, or a subsonic velocity that still outperforms what it was built to replace.
The cartridge he designed to kill the .45 is still alive. But so is the .45. And only one of them has been alive for 120 years without a single year out of production. Put the 10 mm in the woods. Put the .45 everywhere else. And if you can only pick one, ask yourself honestly where you actually spend your time.
Subscribe if this is what you came here for.
10mm vs .45 ACP: The Biggest Lie in the Gun Industry
Jeff Cooper spent his entire career telling the world that the .45 ACP was the gold standard for a fighting handgun. Then in 1983, he designed a cartridge specifically to replace it. More velocity, more energy, more range. The 10 mm Auto was supposed to make the .45 obsolete. 40 years later, the .
45 ACP is chambered in more guns, loaded by more manufacturers, and sitting on more shelves than the 10 mm ever touched. The cartridge that was designed to kill the .45 couldn’t even outsell it. That should tell you something. But what it tells you depends on which question you’re actually asking. And most people are asking the wrong one.
Which one hits harder? The 10 mm. That’s not a debate. A full power 200 grain load from Underwood or Buffalo Bore runs about 1,200 ft per second. >> [clears throat] >> Over 630 ft lbs of energy from a semi-automatic handgun. That’s .41 magnum territory without a cylinder. The .45 in a standard 230 grain load runs 830 to 850.
370 to 400 ft lbs. 200 ft lbs less per trigger pull. If energy is the only question, the 10 mm wins, and this is a short video. It’s not the only question. Quick ground rule. Most factory 10 mm loads chronograph well below what the box says. So, this comparison only uses the 10 mm at its best, and the .45 at its best.
Both running full power. No sandbagging. Even at full power, the .45 does three things the 10 mm can’t match. And the 10 [music] mm does one thing the 45 will never touch. That one thing should decide this for you, but it comes later. First, the thing the 45 does that no energy number captures. When a 45 ACP Federal HST expands 230 grain, it opens to .97 inches.
Nearly a full inch of expanded bullet. That’s a projectile that started at 4.5 2000ths and nearly doubled its diameter inside tissue. The 10 mm’s best expansion from the same gel testing, .81 inches. And that was a lightweight 155 grain load running hot. The heavier 180 grain loads most people actually carry, smaller consistently.
A .97 inch wound channel versus a .81 inch wound channel. That’s not a rounding error. That’s 20% more tissue disruption. 20% more damage from the round that supposedly lost the energy debate. And when a hollow point clogs, and it happens more than anyone in the industry wants to talk about, the 45’s unexpanded diameter is still 4.
5 2000ths versus the 10 mm’s 4.000 1000ths. 12% wider on its worst day. The 45 doesn’t need to expand to outperform a 10 mm that didn’t expand either. Subscribe if you haven’t. Now, the section that changes this entire debate, and it has nothing to do with gel blocks. Thread a suppressor onto a 45. Standard 230 grain hardball at 830 ft per second.
The speed of sound at sea level is about 1125. That round is subsonic. Every factory .45 ACP load on the market is subsonic. You don’t need special ammunition. You don’t need to download anything. You don’t need to change your zero. The ammo in your nightstand magazine right now will work suppressed. Now thread a suppressor onto a 10 mm.
The entire point of the 10 mm is velocity. 1200 ft per second, 1300, 1400 from the hot stuff. Every one of those loads is supersonic. Thread a can onto it and you still get the crack. The suppressor kills the muzzle blast, but the bullet breaks the sound barrier and announces itself to everyone in earshot. You can buy subsonic 10 mm.
200 grain loads downloaded to 900 ft per second. They exist, but think about what you just did. You took the 10 mm only real advantage, velocity, and threw it away. A 200 grain 10 mm at 900 ft per second has less energy than a 230 grain .45 at 830. Less mass, smaller diameter, same speed range.
You turned a 10 mm into a worse .45. The .45 ACP was designed in 1905 to be slow and heavy. That wasn’t a limitation. That was the blueprint. And 120 years later, that blueprint is the reason it’s the best suppressor ready handgun cartridge [music] that exists. No modifications, no specialty ammo, no compromises. The 10 mm was designed to be fast.
Suppress it and you take away the one thing it does better than everything else. If you own a suppressor or plan to own one, >> [music] >> that’s the whole debate right there. But if you don’t suppress and you want raw power for a specific job, here’s where the 10-mm earns what it costs. The Danish military’s Sirius Patrol.
Two-man dog sled teams running Northeast Greenland for 4 months at a time. Temperatures below minus 40. No resupply. No backup. Polar bears that weigh over 1,000 lb and can outrun a dog team on flat ice. Their primary weapon is a rifle. Their sidearm is a Glock 20 in 10-mm. Not because the Glock 20 is the ideal bear gun, because it’s the most practical one.
15 rounds, semi-automatic, light enough to ride on a sled for 4 months without weighing down the gear. Full power hardcast 10-mm drives through heavy bone and dense muscle at depths the .45 cannot reach from a bad angle. [music] When [snorts] a polar bear is on top of you and the rifle is under the sled, 15 rounds of deep penetrating 10-mm is the difference.
The .45 cannot do this job. It doesn’t penetrate deep enough at its velocity to reliably reach vitals through heavy bone at an oblique angle on a large animal. That’s not an opinion. That’s what the penetration data says and that’s what the guys who bet their lives on it chose. If you live or work in bear country, the 10-mm is the answer and the conversation is over.
If you don’t, keep watching because the .45 has one more move that most people don’t even know exists. The .45 Super. Same case dimensions as .45 ACP, same bullet diameter, same overall length. But loaded to around 28,000 PSI compared to the .45 ACP’s mains 21,000, a .45 Super pushing a 185 grain bullet at 1,200 ft per second generates nearly 600 ft lbs of energy.
That’s 10 mm territory from a .45 platform with a wider bullet. What you need to run it, a stronger recoil spring and a supported barrel. Many aftermarket .45 barrels already handle it. Frame does not change. Magazines do not change. Holster does not change. The .460 Rowland takes it further. Same principle.
230 grains at 1,150 ft per second. Over 670 ft lbs. That matches the hottest 10 mm loads with a bullet that’s 50,000 wider. Neither round caught on with the mainstream market. Limited factory options. You are reloading or ordering online. That’s a real limitation. But the physics do not care about marketing. The .
45 ACP platform can reach up to 10 mm power levels. The 10 mm platform cannot cannot reach down to .45 ACP diameter. That equation runs one direction and no amount of velocity changes it. What are you carrying in the woods? What’s on your nightstand? 10 mm, .45, or something else entirely? Drop it [music] in the comments. Subscribe if you have not.
Now, availability. Because this is the part that separates these two calibers more than any ballistic test. .45 ACP has been in continuous production for 120 years. Every manufacturer loads it. Every retailer stocks it. Every gun shop in every state in America has it on the shelf right now. During the 2020 shortage, .
45 was one of the last handgun calibers to disappear and one of the first to return. 120 years of production infrastructure doesn’t vanish overnight. 10 mm is growing. More popular than it’s been in decades. But it’s still niche. During the same shortage, 10 mm vanished early and came back late. Fewer manufacturers, fewer retailers stocking depth.
If your plan depends on finding ammunition on a shelf when the supply chain is under stress, the .45 is the safer foundation and it’s not close. When 21,000 PSI versus 37,500. That gap isn’t just about recoil feel. Lower pressure means less stress on the barrel, the slide, the locking surfaces, and the frame.
A 1911 in .45 that was maintained [music] properly can go 50,000 rounds and still lock up tight. Run that same round count in full power 10 mm through a polymer frame and you’ll be replacing parts. The .45 was built to last because the cartridge was designed not to punish the gun that fires it. 120 years of service life proves the point.
Now, one more play. A Glock 21 in .45 accepts a 10 mm slide swap. Same frame, different slide, different barrel, different magazines. One gun that fires both calibers. .45 for home defense, suppressed, subsonic, quiet. No specialty ammo needed. 10 mm for the woods, full power, deep penetration. The quietest suppressed option and the most powerful semi-auto woods option from the same frame. That’s not a compromise.
That’s a system. So, what’s the verdict? The 10 mm is the better woods gun. Full stop. 15 rounds of hard cast at 1,200 ft per second in a semi-automatic. If you spend real time where large animals can kill you, the 10 mm earns every penny and every bit of recoil. The .45 ACP is the better everything else gun.
Wider expansion, better suppressor host, deeper ammo availability, lower pressure on the gun. 100 years 20 years of continuous production and nobody has managed to replace it. Not Jeff Cooper, not the FBI, not the internet. Cooper gave the 10 mm more velocity, more energy, and more range. What he couldn’t give it was more diameter, more availability, or a subsonic velocity that still outperforms what it was built to replace.
The cartridge he designed to kill the .45 is still alive. But so is the .45. And only one of them has been alive for 120 years without a single year out of production. Put the 10 mm in the woods. Put the .45 everywhere else. And if you can only pick one, ask yourself honestly where you actually spend your time.
Subscribe if this is what you came here for.
10mm vs .45 ACP: The Biggest Lie in the Gun Industry
Jeff Cooper spent his entire career telling the world that the .45 ACP was the gold standard for a fighting handgun. Then in 1983, he designed a cartridge specifically to replace it. More velocity, more energy, more range. The 10 mm Auto was supposed to make the .45 obsolete. 40 years later, the .
45 ACP is chambered in more guns, loaded by more manufacturers, and sitting on more shelves than the 10 mm ever touched. The cartridge that was designed to kill the .45 couldn’t even outsell it. That should tell you something. But what it tells you depends on which question you’re actually asking. And most people are asking the wrong one.
Which one hits harder? The 10 mm. That’s not a debate. A full power 200 grain load from Underwood or Buffalo Bore runs about 1,200 ft per second. >> [clears throat] >> Over 630 ft lbs of energy from a semi-automatic handgun. That’s .41 magnum territory without a cylinder. The .45 in a standard 230 grain load runs 830 to 850.
370 to 400 ft lbs. 200 ft lbs less per trigger pull. If energy is the only question, the 10 mm wins, and this is a short video. It’s not the only question. Quick ground rule. Most factory 10 mm loads chronograph well below what the box says. So, this comparison only uses the 10 mm at its best, and the .45 at its best.
Both running full power. No sandbagging. Even at full power, the .45 does three things the 10 mm can’t match. And the 10 [music] mm does one thing the 45 will never touch. That one thing should decide this for you, but it comes later. First, the thing the 45 does that no energy number captures. When a 45 ACP Federal HST expands 230 grain, it opens to .97 inches.
Nearly a full inch of expanded bullet. That’s a projectile that started at 4.5 2000ths and nearly doubled its diameter inside tissue. The 10 mm’s best expansion from the same gel testing, .81 inches. And that was a lightweight 155 grain load running hot. The heavier 180 grain loads most people actually carry, smaller consistently.
A .97 inch wound channel versus a .81 inch wound channel. That’s not a rounding error. That’s 20% more tissue disruption. 20% more damage from the round that supposedly lost the energy debate. And when a hollow point clogs, and it happens more than anyone in the industry wants to talk about, the 45’s unexpanded diameter is still 4.
5 2000ths versus the 10 mm’s 4.000 1000ths. 12% wider on its worst day. The 45 doesn’t need to expand to outperform a 10 mm that didn’t expand either. Subscribe if you haven’t. Now, the section that changes this entire debate, and it has nothing to do with gel blocks. Thread a suppressor onto a 45. Standard 230 grain hardball at 830 ft per second.
The speed of sound at sea level is about 1125. That round is subsonic. Every factory .45 ACP load on the market is subsonic. You don’t need special ammunition. You don’t need to download anything. You don’t need to change your zero. The ammo in your nightstand magazine right now will work suppressed. Now thread a suppressor onto a 10 mm.
The entire point of the 10 mm is velocity. 1200 ft per second, 1300, 1400 from the hot stuff. Every one of those loads is supersonic. Thread a can onto it and you still get the crack. The suppressor kills the muzzle blast, but the bullet breaks the sound barrier and announces itself to everyone in earshot. You can buy subsonic 10 mm.
200 grain loads downloaded to 900 ft per second. They exist, but think about what you just did. You took the 10 mm only real advantage, velocity, and threw it away. A 200 grain 10 mm at 900 ft per second has less energy than a 230 grain .45 at 830. Less mass, smaller diameter, same speed range.
You turned a 10 mm into a worse .45. The .45 ACP was designed in 1905 to be slow and heavy. That wasn’t a limitation. That was the blueprint. And 120 years later, that blueprint is the reason it’s the best suppressor ready handgun cartridge [music] that exists. No modifications, no specialty ammo, no compromises. The 10 mm was designed to be fast.
Suppress it and you take away the one thing it does better than everything else. If you own a suppressor or plan to own one, >> [music] >> that’s the whole debate right there. But if you don’t suppress and you want raw power for a specific job, here’s where the 10-mm earns what it costs. The Danish military’s Sirius Patrol.
Two-man dog sled teams running Northeast Greenland for 4 months at a time. Temperatures below minus 40. No resupply. No backup. Polar bears that weigh over 1,000 lb and can outrun a dog team on flat ice. Their primary weapon is a rifle. Their sidearm is a Glock 20 in 10-mm. Not because the Glock 20 is the ideal bear gun, because it’s the most practical one.
15 rounds, semi-automatic, light enough to ride on a sled for 4 months without weighing down the gear. Full power hardcast 10-mm drives through heavy bone and dense muscle at depths the .45 cannot reach from a bad angle. [music] When [snorts] a polar bear is on top of you and the rifle is under the sled, 15 rounds of deep penetrating 10-mm is the difference.
The .45 cannot do this job. It doesn’t penetrate deep enough at its velocity to reliably reach vitals through heavy bone at an oblique angle on a large animal. That’s not an opinion. That’s what the penetration data says and that’s what the guys who bet their lives on it chose. If you live or work in bear country, the 10-mm is the answer and the conversation is over.
If you don’t, keep watching because the .45 has one more move that most people don’t even know exists. The .45 Super. Same case dimensions as .45 ACP, same bullet diameter, same overall length. But loaded to around 28,000 PSI compared to the .45 ACP’s mains 21,000, a .45 Super pushing a 185 grain bullet at 1,200 ft per second generates nearly 600 ft lbs of energy.
That’s 10 mm territory from a .45 platform with a wider bullet. What you need to run it, a stronger recoil spring and a supported barrel. Many aftermarket .45 barrels already handle it. Frame does not change. Magazines do not change. Holster does not change. The .460 Rowland takes it further. Same principle.
230 grains at 1,150 ft per second. Over 670 ft lbs. That matches the hottest 10 mm loads with a bullet that’s 50,000 wider. Neither round caught on with the mainstream market. Limited factory options. You are reloading or ordering online. That’s a real limitation. But the physics do not care about marketing. The .
45 ACP platform can reach up to 10 mm power levels. The 10 mm platform cannot cannot reach down to .45 ACP diameter. That equation runs one direction and no amount of velocity changes it. What are you carrying in the woods? What’s on your nightstand? 10 mm, .45, or something else entirely? Drop it [music] in the comments. Subscribe if you have not.
Now, availability. Because this is the part that separates these two calibers more than any ballistic test. .45 ACP has been in continuous production for 120 years. Every manufacturer loads it. Every retailer stocks it. Every gun shop in every state in America has it on the shelf right now. During the 2020 shortage, .
45 was one of the last handgun calibers to disappear and one of the first to return. 120 years of production infrastructure doesn’t vanish overnight. 10 mm is growing. More popular than it’s been in decades. But it’s still niche. During the same shortage, 10 mm vanished early and came back late. Fewer manufacturers, fewer retailers stocking depth.
If your plan depends on finding ammunition on a shelf when the supply chain is under stress, the .45 is the safer foundation and it’s not close. When 21,000 PSI versus 37,500. That gap isn’t just about recoil feel. Lower pressure means less stress on the barrel, the slide, the locking surfaces, and the frame.
A 1911 in .45 that was maintained [music] properly can go 50,000 rounds and still lock up tight. Run that same round count in full power 10 mm through a polymer frame and you’ll be replacing parts. The .45 was built to last because the cartridge was designed not to punish the gun that fires it. 120 years of service life proves the point.
Now, one more play. A Glock 21 in .45 accepts a 10 mm slide swap. Same frame, different slide, different barrel, different magazines. One gun that fires both calibers. .45 for home defense, suppressed, subsonic, quiet. No specialty ammo needed. 10 mm for the woods, full power, deep penetration. The quietest suppressed option and the most powerful semi-auto woods option from the same frame. That’s not a compromise.
That’s a system. So, what’s the verdict? The 10 mm is the better woods gun. Full stop. 15 rounds of hard cast at 1,200 ft per second in a semi-automatic. If you spend real time where large animals can kill you, the 10 mm earns every penny and every bit of recoil. The .45 ACP is the better everything else gun.
Wider expansion, better suppressor host, deeper ammo availability, lower pressure on the gun. 100 years 20 years of continuous production and nobody has managed to replace it. Not Jeff Cooper, not the FBI, not the internet. Cooper gave the 10 mm more velocity, more energy, and more range. What he couldn’t give it was more diameter, more availability, or a subsonic velocity that still outperforms what it was built to replace.
The cartridge he designed to kill the .45 is still alive. But so is the .45. And only one of them has been alive for 120 years without a single year out of production. Put the 10 mm in the woods. Put the .45 everywhere else. And if you can only pick one, ask yourself honestly where you actually spend your time.
Subscribe if this is what you came here for.
