Haven't used the M70 220 Wilson Arrow to harvest fur, mostly to eliminate coyotes around calving time. I've got a "79" Weaver T16 Accu-Trac on it, great match up. My fur friendly rifles are Sako 75 .223 Rem & CZ 22 Hornet.
Had a Hart barrel put on a remington donor. We used a fast twist to shoot 75-85 rain bullets. It is absolutely lights out accurate with the 75's, way past the lighter bullets in my 22-250, which is also very accurate!