i dont see a problem with pellets. I prefer loose because at $13 a lb and 70-80 shots per pound VS god only knows how many with pellets. But i think 100 grains pellets and a bullet or sabot would get it done. Seeing how you shoot round ball, you like the lighter weight bullets. I do to. I used a 385 grain great plains bullet this year so i had to kiss the 140-150 shots goodbye and go back to the 100 yarders or less. Either a 245 -270-295 grain powerbelts will do the job perfectly. even the 338 and 348 i would consider. You pretty much just have to pick one bullet/powder and give it ago and see what it shoots like.