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10mm FBI study |
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tahqua
MODERATOR Have You Driven A Ford Lately? Joined: March/27/2006 Location: Michigan, USA Status: Offline Points: 9042 |
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Posted: March/23/2008 at 10:46 |
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Someone over at Glock Talk was able to get a confidential copy of an FBI report on the 10mm auto
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RONK
Optics Master Extraordinaire Joined: April/05/2007 Location: United States Status: Offline Points: 3199 |
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But, but, I just got a 9mm.....
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martin3175
Optics Master Extraordinaire Joined: January/19/2005 Location: Maryland Status: Offline Points: 3773 |
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FBI is putting our tax dollars to "work"
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tahqua
MODERATOR Have You Driven A Ford Lately? Joined: March/27/2006 Location: Michigan, USA Status: Offline Points: 9042 |
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Smart move |
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cheaptrick
MODERATOR Joined: September/27/2004 Location: South Carolina Status: Offline Points: 20844 |
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That is hilarious.
What's with the .40?? A Kaboom?
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tahqua
MODERATOR Have You Driven A Ford Lately? Joined: March/27/2006 Location: Michigan, USA Status: Offline Points: 9042 |
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I wondered about that but I think it is relative to the 10mm damage. I like the .45 trajectory and the flip off. |
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RONK
Optics Master Extraordinaire Joined: April/05/2007 Location: United States Status: Offline Points: 3199 |
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Yep!
Apparently the feed ramp is cut slightly different in the Glock .40 cal. models than it is in the other models and calibers, leaving the case head slightly unsupported, and historically that is the reason the .40s have a much greater incidence of kabooms, statistically speaking.
edited for grammer Edited by RONK - March/23/2008 at 17:06 |
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cheaptrick
MODERATOR Joined: September/27/2004 Location: South Carolina Status: Offline Points: 20844 |
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I have read that the .40 cal Glocks seem to have more issues than the rest of the line, but I didn't know why. Thanks for that, Ron.
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tahqua
MODERATOR Have You Driven A Ford Lately? Joined: March/27/2006 Location: Michigan, USA Status: Offline Points: 9042 |
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All Glocks have unsupported areas that are common to most autoloading pistols. I've read the same about the .40 Glocks. My G20 has eaten up plenty of Cor-Bon and Double Tap 10mm without a problem. The Glock .40's are the most popular law enforcement pistols out there so I'm not sure what to think
One thing I've seen is that a lot of kaboom reports are not substantiated. Also, there are a ton of people reloading with lead bullets. This is a no-no with all polygonal rifled barrels including my HK's. The .40 Short and Weak is a strong case and can handle any of the pressures the 10mm does. I'm a Glock Talk regular and I just don't see how this got going. Edited by tahqua - March/23/2008 at 17:23 |
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RONK
Optics Master Extraordinaire Joined: April/05/2007 Location: United States Status: Offline Points: 3199 |
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I'm certainly no expert, but the unsupported case head is most often touted as the biggest factor, it seems. I think .40 factory ammo runs at higher pressures than the other cartridges, leaving less of a fudge factor.
Factory ammo seldom causes problems though, according to some. Many of the kabooms are occurring with reloads, and a good percentage of them are with lead, non-jacketed bullets. Evidently the polygonal Glock rifling is susceptible to heavy cumulative lead fouling, which raises pressures over the top. The general concensus is to stick with factory jacketed bullet loads for relative safety assurance.
Edited to note: Posted this before reading Doug's latest reply.
Edited again to correct Doug's name Cheaptrick: Wasn't there an animation of "How A Glock Works" in that Arfcom gif. thread you posted the other day?
That explains it better than I can.
Edited by RONK - March/23/2008 at 18:02 |
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tahqua
MODERATOR Have You Driven A Ford Lately? Joined: March/27/2006 Location: Michigan, USA Status: Offline Points: 9042 |
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You can reload jacketed bullets with no problems also. I use Sierra and XTP in all my Glocks.
Here is a search from GT http://glocktalk.com/forums/search.php?searchid=682659 You can see there is a ton of hits and like I said, there is a ton of |
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RONK
Optics Master Extraordinaire Joined: April/05/2007 Location: United States Status: Offline Points: 3199 |
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Edited by RONK - March/23/2008 at 18:03 |
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tahqua
MODERATOR Have You Driven A Ford Lately? Joined: March/27/2006 Location: Michigan, USA Status: Offline Points: 9042 |
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Ron, it's me Doug. Ted is probably at a parade in San Francisco right now.
I did a quick tear down on two of my guns and dropped some rounds in. There wasn't a bit of difference to the eye. That was a 9mm and 10mm comparo. I'll talk to a friend who has a .45 and a .40 and he can compare. I'll tear down a BHP, HK USP and a 1911 for more spice when I get time. |
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RONK
Optics Master Extraordinaire Joined: April/05/2007 Location: United States Status: Offline Points: 3199 |
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I know it's you, Doug.
Temporary brain damage, sorry!
Ted is probably WHERE??!!
Thanks for checking on the head support issue. I was curious.
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ckk1106
Optics Master Joined: December/14/2007 Location: Arizona Status: Offline Points: 1439 |
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You heard where Ted is. Lets not make an issue out of it. |
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RONK
Optics Master Extraordinaire Joined: April/05/2007 Location: United States Status: Offline Points: 3199 |
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Dale Clifford
Optics Jedi Knight Joined: July/04/2004 Location: United States Status: Offline Points: 5087 |
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Ron, it's me Doug. Ted is probably at a parade in San Francisco right now.
when a 40 and a 10 are compared in the 1911 format, the biggest difference is observed-
none--- most blown glocks occur in IDPA making major with 200 gr bullets, not lead accumulation. 10 cases are really longer than needed and the bullet takes up a lot of unessary capacity, seating a bullet out in a 40 to work in a 1911 magazine will give the same ballistics as any 10. there is no problem what ever with loading glocks with cast lead bullets, if in doubt check out brianenos.com , in glocks the biggest problem with loading to major with the 40 is the torque, which changes the poi considerably, caused by the barrel shifting in lock up. The chamber dimensions of a 40 glock are liberal and there is a term called "glock ring" around the base of each 40 case that will not allow these cases to be used in something like a barsto 40 1911 barrel. which is also more supported and better for making major with 200 gr bullets.
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tahqua
MODERATOR Have You Driven A Ford Lately? Joined: March/27/2006 Location: Michigan, USA Status: Offline Points: 9042 |
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These major power factor guys are stretching to over 35k psi without custom, fully supported barrels in their .40's. We have seen it with the .38 Super crowd, too. Some people just don't get it when they are on the edge.
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tahqua
MODERATOR Have You Driven A Ford Lately? Joined: March/27/2006 Location: Michigan, USA Status: Offline Points: 9042 |
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Where are you getting this from, Dale. I load for both. The 10mm has more case capacity, being 5mm longer and is SAAMI rated for 37.5K versus 35K for the S&W. Edited by tahqua - March/23/2008 at 19:26 |
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Dale Clifford
Optics Jedi Knight Joined: July/04/2004 Location: United States Status: Offline Points: 5087 |
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when the OAL of both rounds for fit in 1911 mags is the same so is the capacity. This is how the 200 grs are making major, in IPSC which uses the sti 40 instead of glocks. The 10 has more capacity only when the length of the 40 is restricted to the approx. 19 mm of the glock mags. Not saying that anyone should mess with standard 40 in glocks, it is being done quite a bit-- just that this is where most of the rumours come from |
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