So i have been working on this for upcoming deer season. Ar-15 built by me. Cal. 7.62x39R 16" barrel 1-10 twist Lee 160-312 15.5 BHN 3 coats of Hitek #2 Gas Checked Sized to .3095 170gr. On the money with gc and coating Seated to crimp groove Hornady Brass Ginex SRP 21.4gr IMR 4227 2068 FPS 5 shot average with 30fps deviation. Shoots well. Feeds 100% smooth cycle and zero pressure signs. Under 1" groups at 100 yards off a front sand bag several times. ZERO leading even with 10 rounds rapid fire. Worked this load up the last few weekends. Then went to casting this bullet in bulk quantity. As it also shoots great out of a .308 win at 2400fps.