Hi, I've got a barrel for a H&R Handi Rifle. H&R 1871 told me that it has a 1 in 20 twist rate (the .44 mag barrel had a 1 in 38 so I got the .444). I've always been curious about using it as a .45-70 surrogate. Does anybody have an idea as to how heavy of boolits will stabilize in this barrel at say 1500 fps.? It being a Handi rifle, recoil will probly be a limiting factor in actuality, but we could still test the ether, and see what is feasible.