Best comparison I can think of that I have shot a lot with would be a 50 cal Hawken style rifle. Pure lead conical at about 1500 or so fps, using a good lube like Bore Butter, or SPG. No leading, and good bullet deformation on whitetails. I would think a properly sized soft lead bullet in your rifle, especially with a gas check, at that approx. velocity, would shoot without much leading, and show good on game performance.
Larry