Funny, I was shooting those same two bullets yesterday out of a 1:28 Green Mountain barrel. Neither would shoot with FFFg, but worked much better with FFg. The minie' started working well at 60gr powder, the REAL worked well at 80gr. The minie' required a fouling shot first - the first one out of a clean barrel would go just anywhere, then the next 4 or 5 would go into pretty much one hole (50 yds) then they got hard to load and groups opened up. The REAL didn't need a fouling shot, didn't ever group quite as well, but still held maybe 2 inches. I could get 6 shots before it needed cleaning. Both were run through a lubrisizer, sized to .500 and lubed with Pearl Lube (soy flakes, Crisco, and toilet bowl rings) The minie' was much nicer to shoot, the REAL really tenderized my shoulder after a while. Either would be fine for hunting, round balls are much nicer for target and plinking and equally accurate.