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PostPosted: Mon Nov 04, 2013 11:47 am 
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Joined: Sat Nov 03, 2007 4:19 pm
Posts: 8978
Location: Coalmont BC
I tried Joe Hickey's idea of using a rock tumbler to smooth off the base of bullets (he was using it for pellets with good success) and it seems to work well for light bullets, but not heavy ones.... I tumbled some .25 ACP bullets for 10 minutes, and they turned from a nice shiny finish with square corners to a dull finish with a nice small uniform radius where the base meets the sides, eliminating the "flash" from the sprue cutter.... So I decided to try some 340 gr. bullets I cast in .457 cal and it basically beat the heck out of them in just 5 minutes.... They were covered in big dents, it looked like they were shot-peened by BBs.... I guess that makes sense, because the .25 cal looked kind of sand-blasted....

I wasn't using any tumbling media or water, just the bullets themselves.... Anyway, I wouldn't try it for anything larger than bullets/pellets that weigh about 50 gr.... You might get away with it witha 78 gr. pellet in .35 cal, but I'm betting a 100 gr. bullet in .30 cal would get pretty beat up.... just too much mass in each moving bullet whacking the other ones whille tumbling....


Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Too many! Springers, Pumpers, CO2, but I love my PCPs and developing them!
Proud Member of the 2000+fps Club!

PostPosted: Mon Nov 04, 2013 1:27 pm 

Joined: Mon Jun 24, 2013 6:54 pm
Posts: 361
Location: Earth
Maybe media acts as inertial buffer for the big'uns?

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