Loaded a batch of subsonic 208gr .300blk, that ended up not subsonic.
I have the Harbor Freight dual drum tumbler and it works perfectly. The capacity is just barely acceptable for pistol brass, but it is really annoying with rifle brass. Whenever I get this done, I'll definitely make a thread explaining what I did..
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I?ve got an amethyst mine. I had an air compressor fail so I made a open ended 60 gallon rolling tumbler for rocks but it would be fantastic for brass. The Trouble is that In polishing the inside of the drum for coating to protect whatever I tumble I discovered that it will hold over 200# of sand. Tumbling Media is lighter, but It will still cost hundreds to load with media whether I?m polishing rocks or brass. I built it for rock but I think it could tumble every piece of brass of every caliber I own at once.
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It was 12gr of 1680 loaded to 2.24" COAL.
I was loading based on a bunch of targets I shot a few years ago and that was the load with the best group. I didn't even look in a book to see what speed that was supposed to be at.
I loaded some Eggleston (original) 200 gr projectiles at something similar and they were definitely subs, but had serious issues.
Hornady shows that load on the edge of sub/super-sonic. Maybe a half-grain less.... good info, thanks!
Out of a 10.5" barrel, by the way.
I didn't try too hard because that projectile is discontinued and I only had 49.