Finally an update loaded some flat base 165's at Hornady suggestion. I used IMR 4064 which the gun shoots 150's with and got a 1.4" group at 50 gr. I'm going to try going down. One ladder to 49.5 and see if it tighten's up a little but that would be acceptable none the less.

It turns out the 150's we have been shooting are flat base as well hmm.

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