I been using 100 grains of GOEX with a maxi ball or 80 grains with a round ball in my Hawkens since I was 12. Seemed like those shot the best groups for me. Recoil never been an issue. Had more than enough stopping power. Never was legal to hunt with a inline until I got to colorado but still prefer the challenge of a flintlock. I would see which weapon the kids prefers shooting.