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Got that same funny guage. I was also fooling around with measurments on the 204. Found that you can't use mixed brass for getting measurments. I took winchester fired brass and checked 10 brass and most were 1.560. Set the RCBS die up to set the shoulder back to 1.559. Checked brass that I resized before by doing to rcbs die instructions and the headspace was set back farther. Will be interesting to shoot these rounds and see if there is any different in groups. Was getting 3/4 in groups before with old eyes so shouldn't be any worse.
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