You might want to try PA conicals. My rifles are 1 in 48 as well and they shoot less than 1.5 MOA, and Ive shot a few 1 MOA groups. The gun can probably do better than that, I am sure that my eyes and the iron sights are most of the variation.Have fired mine at least 50 times and only had 2 or 3 fail to fires using 2f. Keep a good flint on it and keep your touchhole clean and you should be fine. Ive however not had good accuracy using sabots in that gun or my tc firestorm. 1 in 48 twist is a bit slow to stabilize sabots.