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Old 09-18-2012, 11:37   #1
G29SFWTF
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Who's the #@%&* who told me I could shoot .40s&w out of my 10mm bbl?

because it worked just fine in the G29, thanks for the tip

The chamber was a little dirty but after shooting about 70 .40 cal rounds, I loaded up 7 rounds of full power 135gr Underwood 10mm and they still chambered and fired ok. Big difference in sound after shooting all those 40's. I think I woke everyone up on the firing line.
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Old 09-18-2012, 13:23   #2
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Oh the noes! Now little puppies everywhere are going to die and little children will weep, you will go sterile and people will hate you.

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Old 09-18-2012, 13:41   #3
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What would happen in the full size G20 barrel?
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Old 09-18-2012, 14:35   #4
G29SFWTF
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I don't have a Glock 20 but other folks have posted in this thread saying they have no problem with it.

http://glocktalk.com/forums/showthread.php?t=1442850


This will solve my problem of plinking ammo for the 10mm. Bought some .40 Federal 180gr at wal mart for $25 per box of 100. That's approaching 9mm prices. And I have a 23lb recoil spring but still had no problems other than it didn't seem to throw the brass very far, sort of fell on my shoe is more like it.
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Old 09-18-2012, 16:25   #5
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Originally Posted by carlspeed View Post
What would happen in the full size G20 barrel?
Nothing. Not a single thing!

(Unless you load a mag, insert it, cycle the slide, and pull the trigger. In which case, it will go bang, and a bullet will go where you're pointing your pistol. Other than that, quite uneventful....)
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Old 09-18-2012, 16:44   #6
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OMG that is so cool, didn't know you could shoot. 40 out of a G20 stock barrel. Sort of solves the range plinking cost dilema of 10mm ammo.
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Old 09-18-2012, 17:01   #7
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You have gone and done it now! Shooting Short and Weak in a 10mm Barrel ...SHAME on you! What where you thinking?
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Old 09-18-2012, 17:02   #8
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Have at it. Not me! Good to know in a pinch, though.
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Old 09-18-2012, 17:20   #9
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Have at it. Not me! Good to know in a pinch, though.
This. 10mm headspaces on the case mouth, running a 40S&W case in a 10mm chamber means that the extractor is the only thing holding it in.
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Old 09-18-2012, 19:12   #10
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Theres a sucker born everyday.... .40 Smith.. LMAO!
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Old 09-18-2012, 20:10   #11
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I found out something about this recently. I had a bunch of 40 brass that I wanted to decap with live primers (long story). I had my G20 onhand and loaded them from magazines one at a time.

Observations:

Because the cases "head space" on the extractor, many had very very light primer strikes. Some did not fire the first try. A heavier loaded round would likely be less susceptible.

Secondly, extractor abuse. On about 1 out of 5, the case would slip out of the extractor upon primer strike, and was forward inside the chamber. What this tells me is that a live round could slip past the extractor during the engagement of the striker. Upon ignition, the case would slam backward against the extractor and then the breach. It would be like single feeding a 10mm round into the chamber and then letting the slide slam home. You wouldn't know this just by shooting live rounds. Doable in a pinch, but seems a bit unecessarily abusive.
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Old 09-18-2012, 20:13   #12
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Quote:
Originally Posted by glock_19guy1983 View Post
This. 10mm headspaces on the case mouth, running a 40S&W case in a 10mm chamber means that the extractor is the only thing holding it in.
Not true. The case mouth is only a limiting factor. Your 10's still space off the extractor, unless the case is long enough to hit both (about 1.002"). As the slide/breach picks up a round from the mag, it slides up the breach, and under the extractor. The case rim is (should) never be forward of the extractor. If it is, it won't fire.
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Old 09-18-2012, 20:15   #13
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If your going to do this u really need to make sure your extractor holds them tight. I can tell u that.mine did not. I ended up welding mine up and re cutting it to hold it like I wanted.
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Old 09-18-2012, 20:53   #14
Any Cal.
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Quote:
Originally Posted by Taterhead View Post
I found out something about this recently. I had a bunch of 40 brass that I wanted to decap with live primers (long story). I had my G20 onhand and loaded them from magazines one at a time.

Observations:

Because the cases "head space" on the extractor, many had very very light primer strikes. Some did not fire the first try. A heavier loaded round would likely be less susceptible.

Secondly, extractor abuse. On about 1 out of 5, the case would slip out of the extractor upon primer strike, and was forward inside the chamber. What this tells me is that a live round could slip past the extractor during the engagement of the striker. Upon ignition, the case would slam backward against the extractor and then the breach. It would be like single feeding a 10mm round into the chamber and then letting the slide slam home. You wouldn't know this just by shooting live rounds. Doable in a pinch, but seems a bit unecessarily abusive.
I think you will find it different if you use loaded ammo. I have had none of those issues in 700 or more rds.
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Old 09-19-2012, 11:06   #15
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Quote:
Originally Posted by carlspeed View Post
What would happen in the full size G20 barrel?
I shoot them all day in my G20. I don't think it matters, relatively. Just check your extractor and clean your chamber well...esp. b4 going to 10mm rnds. Also, I haven't heard anyone doing this in an auto other than a G20/G29, though. I can't speak for other platforms, personally.
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Old 09-19-2012, 11:15   #16
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Quote:
Originally Posted by _The_Shadow View Post
You have gone and done it now! Shooting Short and Weak in a 10mm Barrel ...SHAME on you! What where you thinking?
"Never Cross the Beams!" ;-)

OP, BTW, that's a great way to start a thread if you want fast attn!
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Old 09-19-2012, 11:30   #17
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Quote:
Originally Posted by Taterhead View Post
You wouldn't know this just by shooting live rounds. Doable in a pinch, but seems a bit unecessarily abusive.
Exactly... 100%. Doable in a pinch, otherwise, do it right. That's my take on it.
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Old 09-19-2012, 19:41   #18
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Agreed with NickE .......Reload your own 10mm rds for "plinking" (if anything from a 10mm could be called plinking) ....LOL
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Old 09-19-2012, 19:53   #19
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Huuummmm....
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Old 09-19-2012, 23:31   #20
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Agreed with NickE .......Reload your own 10mm rds for "plinking" (if anything from a 10mm could be called plinking) ....LOL
I believe the OP doesn't reload...?
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