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Old 06-18-2012, 20:56   #1
B.Reid
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Shooting .40 in a 10mm?

Have any of you tried this out of the 10mm barrel and how did it work out?

Have any of you had a .40 barrel fit to your 10mm? I have a 10mm 1911 and just wondered if it is doable.
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Old 06-18-2012, 21:08   #2
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Lone Wolf, KKM, and Storm Lake all make conversion barrels for the Glock 10's to shoot .40. They drop right in and use the same mag.
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Old 06-18-2012, 21:09   #3
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Won't fit my 1911.
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Old 06-18-2012, 21:49   #4
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I have shot 40's out of my G20SF. I didn't do very many as it just goes against the grain for me, but they shot fine. I bought a KKM 10-40 conversion barrel and it works great.

If your gun will feed the shorter rounds out of the 10mm mags, a conversion barrel would be a pretty simple switch.
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Old 06-18-2012, 22:05   #5
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I've shot quite a lot of .40 duty ammo through my G29Ssf while sitting around the range, waiting for officers to show up. I've never had a problem. Obviously this is for range fun only. No way in hell I'd ever carry like that. I have plenty if .40 Glocks if I need them.
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Old 06-18-2012, 22:46   #6
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I ran some .40 through my g20 by accident one time. I thought I had put in the conversion barrel, but mixed things up. Here's what I found. .40 ammo is about 60-70 fps slower in the 10mm chamber and the primers on the emptys looked like the weren't held real tight to the breach face. But they did fire and function fine. In a life and death situation I think you could get away with it for awhile. I did crono my load in both barrels after I found out I started with the wrong one.
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Old 06-19-2012, 00:34   #7
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I don't hardly use 10mm brass anymore. Don't do it in anything other than a Glock, and don't do it if you have an extended aftermarket firing pin. The head of the brass is the same, you rely on the extractor to head space the case rather than the case mouth. I dropped a loaded round in front of the extractor to simulate a worst case scenario, and the firing pin didn't set it off, after that I didn't worry about doing it.
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Old 06-19-2012, 04:39   #8
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I have KKM's for my G20SF and my G29SF.

They work fine for range fun.
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Old 06-19-2012, 05:08   #9
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They should work fine if you need to do it, but I wouldn't run it regularly.

I don't run regular 87 gas in a 93premium gas vehicle, either. But it would work.
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Old 06-19-2012, 08:52   #10
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The OP is asking about a 1911, so most of the replies may or may not be helpful. I don't have a 10mm 1911, so I don't know if it will work. The Glock design allows a round to be picked up from the mag, and slides up and under the extractor. It will also do this with a 9mm round, which has happened once, when I had a guest at my range (he sourced his ammo from his friend, in a loose box). The 9mm and .40/10mm have only a few thous. difference case head dia. I've put nearly 1,000 rounds of .40 through my G20. Any barrel and spring configuration, not a single failure, of any kind. Shooting .40 began as a convenience, when I was shooting with my son. I shot up all the 10mm I brought out, but wasn't done. Didn't feel like going back to the house for more. I grabbed a handful of .40, loaded up a mag, and went on shooting, business as usual. I was surprised, pleasantly. The upside to it is collecting brass. No matter which bbl/spring configuration used, all the brass falls within 3', unlike 10mm, which launches out of the county with some springs/rounds. The downside is the chamber. After firing .40's, it is imperative that it's thoroughly cleaned, or 10mm may not fully seat. Use a pick to clear it of lube, lead and copper from the chamber. After about 200 rounds of .40, enough residue will collect to prevent my pistol from locking into battery with 10mm, regardless of bullet types used. Easy to correct, just don't forget it!
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Old 06-19-2012, 08:58   #11
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.40 in a 10mm chamber is excessive headspace. Not recommended due to safety.

Best way is to just buy a .40 barrel for your 1911 and have it fitted to your slide.
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Old 06-19-2012, 10:13   #12
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Quote:
Originally Posted by B.Reid View Post
Have any of you tried this out of the 10mm barrel and how did it work out?

Have any of you had a .40 barrel fit to your 10mm? I have a 10mm 1911 and just wondered if it is doable.
I bought the Nowlin 40 S & W drop in barrel for my Kimber Eclipse 10mm and (5 ) .40 S & W magazines from Tripp with a 14 lb recoil spring worked fine but I like shooting the 10mm much more. The .40 feels like shooting 9mm out of the full size Gov. model 1911 and I have a Kimber 1911 9mm gov. full size already. My 40 S & W barrel and mags just sit in the safe.
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Old 06-19-2012, 10:16   #13
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Quote:
Originally Posted by Stkx66 View Post
I bought the Nowlin 40 S & W drop in barrel for my Kimber Eclipse 10mm and (5 ) .40 S & W magazines from Tripp with a 14 lb recoil spring worked fine but I like shooting the 10mm much more. The .40 feels like shooting 9mm out of the full size Gov. model 1911 and I have a Kimber 1911 9mm gov. full size already. My 40 S & W barrel and mags just sit in the safe.
How accurate is that drop in barrel?
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Old 06-19-2012, 10:40   #14
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Originally Posted by B.Reid View Post
How accurate is that drop in barrel?
It was quite accurate at 45 feet at our local indoor range. The barrel also came with a matched barrel bushing.

Last edited by Stkx66; 06-19-2012 at 10:41..
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Old 06-19-2012, 10:44   #15
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I have done it, and also have the 40 barrel. As has been said, not something i'd do regularly. The biggest issues i have come up with is the 40 round can go all the way into the chamber, extractor groove and all due to the longer HS of the 10mm. hard to do a malf drill for that. They seem to feed fine from the mag.
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Old 06-19-2012, 11:03   #16
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There are aftermarket conversion barrels chambered in 40S&W for the 10mm 1911 guns, some will require fitting, or barrel bushing specific to the barrel. Be sure if you need a non-ramped or a ramped type barrel before ordering. The 40S&W cartridge usually work from the 10mm magazines.

Usually Match Grade barrels require fitting for best accuracy.
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Old 06-19-2012, 15:25   #17
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The 10mm magazines would not feed the 40 SW rounds with only the drop-in conversion barrel in my Kimber. I thought I could use the 10mm mags- not so. I had to buy 40 S W mags to make the pistol function properly.
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Old 06-19-2012, 20:24   #18
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Quote:
Originally Posted by dm1906 View Post
The OP is asking about a 1911, so most of the replies may or may not be helpful. I don't have a 10mm 1911, so I don't know if it will work. The Glock design allows a round to be picked up from the mag, and slides up and under the extractor. It will also do this with a 9mm round, which has happened once, when I had a guest at my range...
I agree. 40 S&W in a 10mm barrel is safe in a Glock (with stock slide parts).
In a 1911, it will work fine most of the time, but is not a good idea, because the firing pin is long enough to ignite the primer of a round that jumps in front of the extractor. This causes the brass to slam back into the breech face with enough force to deform it significantly (looks like severe over pressure), usually shearing the brass rim off as it passes over the extractor.
2 problems with this - #1 it could eventually break the extractor. #2, the case could potentially rupture, with results similar to an over-pressure Kaboom. Neither has happened to me, fortunately.

Here are two pictures to illustrate what I'm saying.
This one shows a Glock and a 1911 slide, both with firing pins forced to full travel. Notice the Glock firing pin doesn't reach past the extractor, and won't fire a round that misfeeds.
The 10 Ring

This is a 40 S&W case that jumped in front of the extractor. This was in a EAA Witness 10mm, but would look the same from a 1911.
The 10 Ring

Same case, from the bottom. Note the mild case bulge; this was factory 40 S&W ammo.
The 10 Ring

Last edited by Yondering; 06-19-2012 at 20:25..
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Old 06-19-2012, 20:30   #19
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Along with my comments above, one more point to make:

In a 1911, there is some benefit to using a 40 S&W barrel, and having it long-throated, if you are a handloader, so you can load to 10mm OAL (1.260") using 40 S&W brass. This works well with jacketed bullets 180gr or heavier, and some heavy cast bullets. The loads will be slightly different, but you can replicate 10mm loads, while using the cheaper 40 S&W brass.

In a Glock, you can do this and just use the 10mm barrel, of course.

The 10 Ring
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