Have had exactly the opposite results with Hornady ammo. If I must shoot factory that's what I use. Have a Ruger 77 Varmint in 220 Swift that I bought some Hornady Custom 55gr. SP's for when I first got it. Would shoot 1/2" 5 shot groups all day. Also chronographed at 3950. Haven't been able to beat it much by handloading.
