Posted: 4/17/2009 8:36:42 AM EDT
Why is the soot crud only on one side of all my brass? This is after tumbling 1 hr w/corncob also. Guess I need to try the walnut first.
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Quoted:
Most soot problems come from not enough chamber pressure to occlude the chamber. Take a look at some cowboy brass some time! I believe the term is obduration, but the comment is correct. Chamber pressure short of enough to fully expand the brass won't seal out the expanding powder gas, so a bit of the soot (byproduct of the burning powder) flows back past the case mouth and leaves those marks. It's common in straight wall cartridges, but harmless as far as I know. My .45 Colt brass fired through a Model 94AE does it all the time. Walnut media will scrub it off a lot quicker than corncob. Clean with walnut, polish with corncob. |
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Quoted:
Quoted:
Most soot problems come from not enough chamber pressure to occlude the chamber. Take a look at some cowboy brass some time! I believe the term is obduration, but the comment is correct. Chamber pressure short of enough to fully expand the brass won't seal out the expanding powder gas, so a bit of the soot (byproduct of the burning powder) flows back past the case mouth and leaves those marks. It's common in straight wall cartridges, but harmless as far as I know. My .45 Colt brass fired through a Model 94AE does it all the time. Walnut media will scrub it off a lot quicker than corncob. Clean with walnut, polish with corncob. Thanks for the info guys, I appreciate it 
Blackops_1. |