Quoted: Why in the hell would they tumble it, Ive been reloading for years now and have always been told and read in the instructions with my tumbler that you should never tumble the ammo after it is loaded and live for fire? "Rreason is that it is very dangerous and the ammo can actually discharge while tumbling. So why do they do this and take that chance?
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ALL commercial ammo manufacturers tumble their ammo clean after loading (except ammo for military contracts).
Why is that caution in your tumbler's instructions?
1. Lawyers. This is self-explanitory, right?
2. Some older European, South American and Soviet ammo can be found loaded with powders that have large, square or rhumbus-shaped granules that are prone to breakage when cleaned in a vibratory cleaner or tumbler. Breaking down the granules increases the burn rate of the powder and can result in very high pressure spikes.
Modern powders are essentially immune to this problem, within reason, so it isn't a problem. If it was, don't you think Black Hills or the other manufacturers would know, from experience, that it was?
-Troy