I did a small experiment today. I had watched a video where a guy had said he never cleaned his brass or did that much prep at all. I have been pretty meticulous about trimming, chamfering, deburring, uniforming the primer pockets, and tumbling the brass. So today I took 5 pieces of once fired brass, neck sized them only, and reloaded them. I then took 5 pieces of fully “processed” brass that was full length resized, and then reloaded them. Both of them loaded with Hornady 140 grain BTHP and Superformance powder, seated .020 off the lands. I shot a group of each at 100 yards, and guess what? Not a single bit of difference! Both groups were just under 1/2”. It was a small sample size, but definitely has me reconsidering all the prep work I have been doing!
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