So, is the "slam-bang" in an SLR more violent than that of a levermatic? I'm doubtful. Ran a bunch of BHN 9-10 thru a Model 94 at velocities in the 1700-2100 range with conventional lube and a gas check...no leading and accuracy was acceptable.

50 yard sample:
[Linked Image from i.imgur.com]

What Gnoahhh said in spades. Accuracy pivots on fit, bullet quality and load, far more than BHN. My suggestion for your project, in regards to BHN is 8-9. "Hard" ain't your buddy when shooting low velocity/pressures. Case in point is the .30 Sneezer, which is happy as a pig in mud with BHN9, but will lead a bit with WW/tin alloy at 1050 fps +/-.

I am..........disturbed.

Concerning the difference between man and the jackass: some observers hold that there isn't any. But this wrongs the jackass. -Twain