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Old 06-03-2013, 16:08   #1
Sierra9
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Underwood 200 gr XTP JHP

Shot a box of fifty in my stock Glock 20. I reload, so collect the cases. Eight of the fifty had either case head separation or splits along the length of the case. Anyone else experiencing this?
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Old 06-03-2013, 16:38   #2
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I've heard about it. Underwoods loads them hot, probably a little too hot.
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Old 06-03-2013, 18:22   #3
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That should NEVER happen with new brass, never. I have seen it with worn out brass, but never new. It's why I stay away from these boutique ammo companies. These kind of events give me great pause. You want hot 200gr XTP, but the Hornady +P stuff.
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Old 06-03-2013, 18:38   #4
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Quote:
Originally Posted by Sierra9 View Post
Shot a box of fifty in my stock Glock 20. I reload, so collect the cases. Eight of the fifty had either case head separation or splits along the length of the case. Anyone else experiencing this?
Just curious-

Of course, even if they do, it doesn't rule out the possibility of defective brass, but does Underwood ever state anywhere that they load to SAAMI specifications?
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Old 06-03-2013, 19:36   #5
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This particular brass has their name on it. So it's hard to know who made it. In the past I've seen them use Starline.
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Old 06-03-2013, 19:41   #6
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That load is 1250 fps and 694 ft. lbs per the website, I can't imagine that's out of Sammi specs.
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Old 06-03-2013, 19:48   #7
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What Gen is your Glock 20?
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Old 06-03-2013, 21:31   #8
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Can you post some pictures of the brass?

I've got to go with Fred on this. If I was working up a load and saw this I'd stop immediately. That it comes from a manufacturer is unsettling.

Now, you could have issues with your barrel, or the brass has problems, etc., but stop shooting until you find the answer.

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Old 06-03-2013, 21:48   #9
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What Gen is your Glock 20?
Gen 4
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Old 06-03-2013, 21:53   #10
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Quote:
Originally Posted by dougader View Post
Can you post some pictures of the brass?

I've got to go with Fred on this. If I was working up a load and saw this I'd stop immediately. That it comes from a manufacturer is unsettling.

Now, you could have issues with your barrel, or the brass has problems, etc., but stop shooting until you find the answer.

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Photos I'll try tomorrow.
The G20 is brand new, and I've fired DT and handloads (reloaded 6-7 times) without splitting cases. I think the barrel is fine.
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Old 06-03-2013, 22:11   #11
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I know that DT once got a soft batch of brass.

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Old 06-03-2013, 23:44   #12
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Quote:
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That load is 1250 fps and 694 ft. lbs per the website, I can't imagine that's out of Sammi specs.
Since vel has nothing to do with pressure specs, that sure could be. COnsider most+P 200gr loads are runing about 1050fps, that is quite hot. It's always how you get there, not the journey.
If they are using Starline brass, Starline does make custom headstamps, then their brass has always been very high quality. It's what I buy when I am looking for 10mm or magnum brass. SO something is certainly wrong. I would be contacting Underwood w/ a lot# & tell them what happened.
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Old 06-04-2013, 02:11   #13
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When did you purchase the ammunition? Where did you purchase the ammunition? Have you notified Underwood of the serious problem? Since your pistol is new you may have an out of spec barrel, the brass is defective, over-charge, over tight crimp or bullet seat depth problem. I have recently seen a brand new 45 ACP Remington case split from the case mouth to the cartridge head so during this period of over production there will be more defective ammunition then normal. I will be testing some 10 mm 200 gr XTP JHP Underwood ammunition (purchased in May) in the next week so I will post the results soon.
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Old 06-04-2013, 08:38   #14
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Photos, but not sure if this is going to work.Click image for larger version

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Click image for larger version

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Last edited by Sierra9; 06-04-2013 at 11:22..
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Old 06-04-2013, 08:45   #15
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Quote:
Originally Posted by vulcan71 View Post
When did you purchase the ammunition? Where did you purchase the ammunition? Have you notified Underwood of the serious problem? Since your pistol is new you may have an out of spec barrel, the brass is defective, over-charge, over tight crimp or bullet seat depth problem. I have recently seen a brand new 45 ACP Remington case split from the case mouth to the cartridge head so during this period of over production there will be more defective ammunition then normal. I will be testing some 10 mm 200 gr XTP JHP Underwood ammunition (purchased in May) in the next week so I will post the results soon.
I bought this ammo directly from Underwood on May 1. I have not notified Underwood. As a reloader I am familiar with what can go wrong in ammo manufacture. To satisfy those who think I may have a barrel problem, I will later go out and shoot fifty more rounds using a KKM barrel. Stay tuned.
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Old 06-04-2013, 09:38   #16
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They look a little swollen also. The KKM should be a bit tighter with a bit more support. I was having FTFeed issues with Underwood 165 and 180 TMJ in my LW barrel. The stock 20 barrel of my G4 20 is much tighter than two previous 20's I've had. No issues feeding through the Glock barrel and no excessive bulging.
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Old 06-04-2013, 10:30   #17
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I've pulled Underwoods ammo before and they have no issue going well over book max and selling it to the public. They used to use 800x and maybe they still do, but recently I've seen where Underwood and Buffalo Bore are using Power Pistol charges that are 13-15% over book.

What most pass off as full power or "real" 10mm loads are more often than not overpressure as well.
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Old 06-04-2013, 10:57   #18
Sierra9
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I shot fifty more through my 6" KKM barrel. I got five split, but these splits are in a different place. They are across the case about a third of the way from the bullet end of the case instead of running the length of the case. I would like to show a pic, but it says I have exceeded my picture allowance
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Old 06-04-2013, 11:15   #19
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Quote:
Originally Posted by gatorboy View Post
They look a little swollen also. The KKM should be a bit tighter with a bit more support. I was having FTFeed issues with Underwood 165 and 180 TMJ in my LW barrel. The stock 20 barrel of my G4 20 is much tighter than two previous 20's I've had. No issues feeding through the Glock barrel and no excessive bulging.
Almost looks like what you get if you run 9mm ammo through a .40 barrel or .40 ammo through a .45ACP barrel.
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Old 06-04-2013, 11:45   #20
Sierra9
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Originally Posted by gatorboy View Post
They look a little swollen also. The KKM should be a bit tighter with a bit more support. I was having FTFeed issues with Underwood 165 and 180 TMJ in my LW barrel. The stock 20 barrel of my G4 20 is much tighter than two previous 20's I've had. No issues feeding through the Glock barrel and no excessive bulging.
They actually aren't that swollen. What looks like a smiley in the one pic is just a split, no smiley.
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