100grNP: I use it in several of my 220 Swifts. Just checked my handloading log book and 6 (six) of my 8 (eight) heavy barrel Varmint Rifles in caliber 220 Swift "prefer" (best accuracy!) IMR 4064!
The other 2 (two) are running H 380.
Long live IMR 4064!
Hold into the wind
VarmintGuy
