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Using 2 pounds more of the SS media than the brass will give the best results.
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Wow, I guess I really lucked out! I just weighed things and found out I had been using only 7.89 ounces (about half a pound) of pins, and I had been tumbling sometimes 250 cases or more (.45 ACP) in a batch.
250 .45 ACP cases (without primers) weigh about 2.9 lbs, let's say 3 lbs. That means according to the formula above, I should have been using 5 lbs of SS pins, but I was only using about 1/10 of that amount!
Makes me want to dirty up a bunch of cases and try it again with more pins.
In one of my other threads, surf 'rett mentioned:
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In the small tumbler, I run a 3:2 ratio of pins to brass by weight; 24 ounces of pins to 16 ounces of brass
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If I used that formula, my small batch of pins should have been able to adequately do about 28 cases; 50 cases should need about 1 lb of pins; 250 cases should need about 4.5 lbs of pins.
Thanks for all the info!
Lou