Top bullet is a 30-30 for comparison. Tapered body for ease of loading, angle of the shoulder and the long neck are not conducive to the best powder burn. I use a 250 gr SP bullet not exactly aerodynamically designed for long range accuracy.
I shoot 2" groups 1" low at 50 and around 3"-4" groups 1" high at 100 yards. I don't think I could hit anything past 150 with those buckhorn sights unless I was shooting off a sandbag from the bench but I don't shoot that gun off a bench. Tried that once and it was a boo boo. I'm sure the bullet will hurt you a long ways past 150 yards but hitting the target from offhand is my limiting factor.