Tried 56-57.5 of Imr 4350. With 165 gr. GMX.
Seated. .020 off the lands.
57.5 left a little wiff of smoke coming from the bolt after I shot. I thought uhoh. But the brass extracted ok examined the primer, did not smear it, but there was a little gray/black circle on the brass around the primer pocket, so I figured that was my limit.
56 grains actually produced the best results, somewhere in the neighborhood of .5 inch 3 shot group. I figured good enough for my Ruger MKll M77 boat paddle. When I got the gun, I bedded it, free floated, worked the trigger down to 1.5 oz's, and had it braked. Then duracoated snow gray.
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Last edited by j2dogs; 05/02/13.