Posted: 7/18/2017 9:54:20 PM EDT
| Got one on the way. Who makes a .40 barrel for this beast? |
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Quoted:
Why? 10mm is best mm. ETA: Recoil in the Gen4 G20 is so nice. Not snappy like the 9mm's I have and not quite the same push as my 1911 and weights a half that the 1911 does as it is all metal. Very easy to control. |
.40 S&W is 10mm. Just shorter and weaker.  I have watched guys shoot .40 out of a stock 10mm with no ill effects. The analogy I was given was shoot .40 out of a 10mm like you shoot .38 out of a .357. I don't know that I would do it, but I have seen it done.
YMMV |
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Read this thread on Glocktalk. A guy name WeeWllly explains why the 10mm doesn't need a .40 barrel to shoot .40
https://www.glocktalk.com/threads/now-ive-went-and-bought-a-g20sf.1663574 |
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Both 38 special and 357 mag headspace off the case rim, which is the same between the cartridges.
40S&W and 10mm both headspace off the case mouth, which changes between the cartridges. Though I'm sure it works because enough people have done it. I have a KKM barrel in 40S&W. I didn't want to put the extra stress on my extractor on a pistol I'll also be using for woods carry protection. So I got the new barrel. I don't always stand in the same spot when shooting pistols. Sometimes I'm even running. My G40 is the only centerfire cartridge pistol I have with a red dot. If I ever wanted to shoot it in a local competition for fun, didn't want to lose all of that expensive 10mm brass. I have SO MUCH 40S&W brass stockpiled. It just made sense for me to get that barrel for my G40. I agree, 10mm is the best millimeter. Some may even call it a centimeter. ;) |
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Quoted:
Both 38 special and 357 mag headspace off the case rim, which is the same between the cartridges. I've got a .40 barrel for my G29, but rarely use it. |
| Buy a .40 barrel if you want it, KKM makes the best barrels in my opinion. The barrel is the only truly safe way to do it, I would never advocate shooting .40 out of a 10mm barrel because the only thing hold the cartridge in place is the extractor, so it's doing a job it was never intended to do. The .40 conversion barrel makes it safe. |