I ran into similar issues with SD's going wonky when I used a wet pin tumbler on my brass. This was with .308 Federal Match. I stopped it and now use my sonic cleaner, dehydrate at 110 degrees for a few hours, then tumble in corn cob with some Dillon polish if needed. It has helped a lot.
I keep reading that over tumbling is kind of hard peaning the brass? Not sure if that's the terminology or not, but there could be some truth.That's along the lines of what I needed to hear. I am going to try several ways and record velocities to see if there is a trend among ES and SD. Not that 24 and 9 is bad really...but I was getting spoiled with single-digit ES across a variety of loads.
Might find something I stick with for years.
FWIW, my overall velocities with Varget and the 123gr Scenar were within 5 FPS of what they were with virgin brass.
I keep reading that over tumbling is kind of hard peaning the brass? Not sure if that's the terminology or not, but there could be some truth.
I just loaded up some more seating depth test subjects at 40.9 grains of H4350 to test when my bolt is returned, and reminded me of how much I prefer a little carbon in the neck when seating.
I spoiled myself rotten loading this 300 PRC and sub 5 SD's. I didn't load a bad load the entire time. I wish everything went so smooth
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