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320pf,
Thanks for the info, headspace sounds like the answer....makes sense now that I think about it....for about the last year I had been full-length sizing and had never tried moving the shoulder/die up more that the die maker recommended one half turn up from top of ram stroke....
On a side note, I found that by neck-sizing only about 75% of the neck and leaving the 25% at the shoulder fire formed to chamber size my groups got considerably better, I guess it helps center the neck in the chamber better or causes less tension on the bullet??
Thanks again....I'll try a few different full-length shoulder heights to see what fits....
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