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Discussion Starter · #1 ·
I was shooting my dad's new USPf 45 and noticed something funny about the extracted cases. They all have burnt marks starting at the case mouth and going about 3/4 of the way down to the rim. Only one side of the cartridge is charred though (about 20% of the total surface area). The ammo used was Winchester white box 230 gr. I've never had this issue with my USP9. Is this normal?
 

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i dont know about marks only going down one side of the cases, my 45f with ah date code makes burn marks of no real pattern. some the whole case has burns others in one spot i haven't seen any consistent or repeatable burn patterns though. did the gun fire ok? was any thing out of the ordinary that you noticed?
 

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I get pretty much the same results out of my USPc 9mm...Shoots fine, so I'm not all that worried about it.

My 1911 shows some fouling/burning about 1/8-1/4 of the way down the cartridge all the way around on 90% of the first 80 or so rounds fired until it gets dirty...then the cases are all pretty clean.
 

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Discussion Starter · #5 · (Edited)
i dont know about marks only going down one side of the cases, my 45f with ah date code makes burn marks of no real pattern. some the whole case has burns others in one spot i haven't seen any consistent or repeatable burn patterns though. did the gun fire ok? was any thing out of the ordinary that you noticed?
Other than the burn marks, the gun functioned 100%, as you would expect from an HK pistol. Could it be that the chamber is machined in a slightly uneven manner (i.e. slightly elliptical), allowing gases to leak out on one side? Would this be cause for concern?
 

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Ive had the same exact results with WWB, I just figured its due to how dirty the ammo is.

After 250 rounds of it, my HK is almost bleeding soot.
 

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This happens in all of my 45s depending on the ammo. Dirtier ammo seems to do this more in my experience.
 
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