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6PPC tuning

If you don’t have it find a copy of Tony Boyer book study his method of finding seating depth

This is the basics. On one piece of target pale perform a test either in from just touch or back from full jam in .003 increments with three different powder charges a light medium and hot load at the different seating depths
A couple of examples attached
 

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I agree with Tim's seatng depth comment. Once I get a load worked up with powder/bullet combo with a low SD, I work on seating depth. I know it's old school, but if you have a Wilson micrometer seating die and arbor press at the range it really makes it easy.
 

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