Dangerous Reloading Practice

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seems like the real way to test the thesis is take a known load quantity that produces a repeatable ES and SD on your chrono, put a bunch of loaded ammo on the tumbler and pull 5 rounds out every 15 or 30 min and label them, shoot them over the chrono once you've got a good sample size just like working up a load.
 
Been done over and over in magazines and message boards. Test after test. I've never seen that anybody has observed a change with a reasonable amount of time in a tumbler.
 
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