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I just used my Sinclair primer pocket uniformer on some new 7x57 brass and it took out a little brass in a third or less of the pocket on less than half the cases. I'll see how they square up after a first firing.

Just signed up.... first post... I shot many a thousand rounds of 223 in HP competition and kept it simple. Used 69s, 77 mk, and 75 amax and used 24.5 grains of either Varget or RL15 regardless of bullet seated to mag length. On the 75s I was 15/1000 into the lands but that was for 600 yd and...