Well, I had to take the old Mosin out today. I didn't have any of the IMR-4320 loads on the shelf, just some old H380s. Both 150 and 180 Sierra ProHunter over 52 gr H380. The 180s run the same velocity as my IMR-4320 loads and the Wolf commercial. The 150s run about the same, kinda slow for that bullet. (Don't remember why I loaded those.) Be it as it may, the 150s were pretty erratic. The 180s did well. The first 3 went under an inch, first 4 1 3/4", then they spread out. I was just banging away, not really letting the barrel cool. I need to do some more shooting, but right now, I will go with Sierra ProHunter 180 at about 2,550. YRMV