Ok, got another Newb quesion. Ive noticed that all of my brass (.45acp) seems to have a sooty black burn mark down one side of the case. This is coming from shooting both factory and reloads in two different HK firearms. For the first few firings the "black" seemed to wipe right off, now Im on my 3rd firing of a batch of brass that has been tumbling in walnut for over an hour and the burn marks are still there.

What causes this, and is it a problem??

quote:

Originally posted by 28sstony:
What causes this, and is it a problem??

I wish I knew, and it doesn't seem to be

My medium-high powered loads do the same thing. I haven't shot factory ammo for quite some time, so no help there...

I'm guessing it's due to the 45acp not being a high pressured round and the case is not really expanding in the chamber that much.


BTW, I'm shooting a Springfield XD

My experience is the same as CharlieHo's: if the pressure is low the case will not expand totally and you will get some blow-by. I see this more often in my 45 ACP revolvers (S&W models 25 and 625) because the chambers in a revolver are not all identical and it seems to happen more often in certain chambers than others. But the same came occur in a 1911 or any other semi-auto. If you want to keep velocity low, or at the same level, try a faster powder.

try turning the gun upside down & see if the mark is on the other side. If it is you may need to shoot sideways its very late friday & my brain is tired, and beside i'm going to S.D. to shoot pheasants and buffalo tomorrow)