I worked up this load several years ago for a Wy. Antelope/Mule Deer hunt. The gun is a Rem. Mtn. rifle with a very slender barrel. PLEASE BE ADVISED, THIS LOAD IS A LITTLE WARM. Primers were fine, just a slight extractor mark on a couple of cases all mic'd within specs. IN YOUR GUN PRESSURE MAY BE DIFFERENT!
45.2 gr IMR4064, Hornady 139gr SST, CCI 250 primers. Avg. speed 2978, ES 26.6 SD 10.0
Shot was taken at 286 yards. I was aiming just behind the shoulder of the Antelope but the cross wind was stronger then I thought. Bullet entered dead center low on the right shoulder, took out the top 2/3 of the heart and exited off side shoulder. The goat never took a step, fell on his nose, and kicked a rear leg once.