Rocket35 Posted July 13, 2007 Share Posted July 13, 2007 I looked around and didn't find any info on this, so here is the question. Does new or once fired brass perform at a higher velocity than old used practice brass? I was chronographing today and this thought re-entered my mind. I have often wondered as I would like to use old brass at the "lost brass" matches. What are your findings/opinions? Link to comment Share on other sites More sharing options...
HSMITH Posted July 13, 2007 Share Posted July 13, 2007 Hasn't made a difference to me, none that I have been able to track with any repeatability anyway. Brass is brass as far as I am concerned, it is like a light bulb in that it works fine or it doesn't work at all. Link to comment Share on other sites More sharing options...
G-ManBart Posted July 14, 2007 Share Posted July 14, 2007 You might see a slight difference, but I doubt it would be significant. Easy way to find out would be to compare new with old loaded identically otherwise. I haven't seen any difference between once fired and cases that have been used five or six times (I try to note such things when I chrono). If anything, I'd guess the biggest difference would be between new and cases that have been fired half a dozen times or so. I know some large rifle cases will show a noticable difference between new and cases that have been fired, resized, and trimmed a couple of times, but I'm guessing that's because the used cases have a slightly different volume after being stretched, trimmed etc. Link to comment Share on other sites More sharing options...
Larry White Posted July 14, 2007 Share Posted July 14, 2007 (edited) As brass is reloaded it gets harder as it is resized, belled and crimped. I would think that new brass, being softer would expand to seal the chamber better and faster. Thats just what I think. Could the average reloader with a chrono prove that? I doubt it, too many other vairables. If its not cracked and the rim looks ok its good as far as Im concerened.-----------Larry Edited July 14, 2007 by lkytx Link to comment Share on other sites More sharing options...
shred Posted July 15, 2007 Share Posted July 15, 2007 Brand new pistol brass chronos slightly different for me (usually a little bit higher), but the difference is pretty much insignificant. Link to comment Share on other sites More sharing options...
Rocket35 Posted July 16, 2007 Author Share Posted July 16, 2007 OK- thanks everyone for all your insight. Link to comment Share on other sites More sharing options...
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