Posted: 1/16/2013 2:41:44 AM EDT
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I read where a person shot .40 s&w through their Glock 10mm.
Is this something that can be done regularly as a range practice? I understand the barrel size may be the same but it would be like shooting .380 through 9mm and not have enough pressure to move the slide and eject casing properly. It would be nice to have the 10mm as a personal protection round at home and have the .40 to practice for price purposes. Thanks |
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Quoted: I read where a person shot .40 s&w through their Glock 10mm. Is this something that can be done regularly as a range practice? I understand the barrel size may be the same but it would be like shooting .380 through 9mm and not have enough pressure to move the slide and eject casing properly. It would be nice to have the 10mm as a personal protection round at home and have the .40 to practice for price purposes. Thanks I don't see how it would feed from the 10mm magazine, the 40SW mag is too small, possibly fired by feeding it as a single shot. The case is too short and won't headspace right, it has to be held into place by the extractor. Some things just weren't meant to be done |
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Magazine is not the issue. Chamber length is as you state. People have done it, but it's not safe or correct..........I would NOT. Just swap barrels. Fun and easy.
Think about what is holding the case when the primer is struck. Again - you nailed it the extractor. |
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Quoted:
I read where a person shot .40 s&w through their Glock 10mm. Is this something that can be done regularly as a range practice? I understand the barrel size may be the same but it would be like shooting .380 through 9mm and not have enough pressure to move the slide and eject casing properly. It would be nice to have the 10mm as a personal protection round at home and have the .40 to practice for price purposes. Thanks It can be done for about $125 or so. Just buy a .40S&W barrel. Too easy. Everything else stays the same. I do this with my Glock 20 - 10mm, .40S&W and .357SIG. (In my Sig P229, it's 40S&W and .357SIG) All with a quick barrel swap. |
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It's truly amusing to me when folks post fallacious opinions as facts on forums like this. ".40 won't have enough energy to cycle the slide, blah, blah, blah....won't feed from 10mm mags, blah, blah, blah....., etc., etc., ad infinitum."
How the hell do you "experts" think the 10mm/.40 conversion barrels work?? 
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Just because you can do something doesn't mean you should. Yes, you can fire a std 40s&w out of a 10mm Glock. Yes, the ammo will feed from the 10mm mags (best if you make sure the base of the rounds are at the back of the mag). Yes, the 40s&w round will headspace off of the extractor because the chamber is .125" longer. Yes, standard velocity 40s&w is enough to cycle the action. Are there any possible issues? Yes. * You can have misfires because the extractor isn't holding the case base tightly enough against the breachface. * You can put enough strain on the extractor to eventually break or chip it. * You can have issues with carbon fouling the front of the chamber so that after a while it's hard to chamber a true 10mm round (can be avoided by really thorough cleaning). * You can find that you have poor accuracy because of the bullet jump across the extra .125" to the rifling. * You can have other issues. The question is more, why? If you are considering a steady diet of 40s&w because of the ammo cost difference between it and 10mm you could buy a conversion barrel and save some money or you could put the cost of the barrel towards a reloading system and save a ton of money. I load both 40s&w and 10mm from mild to wild and once you have the 10mm brass and assuming you use the same bullet, the cost difference between handloading 40s&w using the cheapest powder (TiteGroup) and mild loads vs 10mm hot loads using a true magnum powder (Power Pistol) is about 1½¢ per round. Yes, the 10mm's brass is not readily available as range pickup like the 40s&w is (however, I've found a surprising amount from time to time at our range) but you buy good quality Starline brass and it will last for 10+ reloads of near full power ammo and that means that the cost is greatly reduced. Further, the cost of handloading 10mm, even including the cost of the brass amortized over 5 reloads is considerably lower than the cost of even the cheapest Winchester White Box 40s&w ammo at WalMart (Assuming they had some these days). How much cheaper? I handload my 10mm using Berrys, Rainier, or X-Treme plated 165grn bullets for under ½ the price of WWB. So, with the opportunity to reload 10mm at a significantly cheaper price than buying 40s&w, why would anyone want to shoot 40 our of their 10mm?? |
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Quoted:
So this tells me that my G21 will not only shoot 10mm with a barrel swap but also .40 with another barrel. Or did I miss something? Yes, If someone is making a .40 conversion barrel for the G20 you could. You will need to use G20 Mags. The 400 corbon conversion is available for the G21. |
| I use a conversion barrel in my G20 and shoot 40S$W and 357SIg in the gun.That way you have all three calibers with one gun. Think about the Glock 20 as your bug out gun. With all three barrels you can find ammo almost anywhere. I also have a G21 upper that will give me 45ACP also. 4 in 1 |