Well, here it is:these loads are with 139gr. Hornady SP flatbase
53gr H-4350: 2864fps, ES=38, SD=5.4
53.5gr. H-4350: 2891fps, ES=44, SD=9.8
Old load that I've used for 4 years using 139gr. Hornady SST
57gr IMR 4831:2982fps, ES=39, SD=7.8
Brass was R-P cases that were once fired for the H-4350 loads and 4X fired on the IMR 4831 loads. WLR primers use in all loads. Rifle is a Ruger M77 Mk II stainless/laminated. Chronograph was 15' from the muzzle and temperature was 70 degrees.
I'll retest these loads again as this was the first time that I've used a chronograph. I let the barrel get a bit warm so that may have had an effect on the ES/SD. Not too mention I had to figure out how high/low to hold. I marked the rods with tap and was a bit too high I think. Vels seemed more consistant when the barrel wasn't overly hot.
