I have a marlin 30-30 with a sweet vintage redfield peep sight. I use the raw aperture, with no insert. It is incredibly fast on target. I had the sight on my old .35, and shot deer out to 100 yards with it, but now I also have a scoped rifle, and only use the marlin in short range situations. The longest shot I've taken with the 30-30 is about 20 yards. I also have an extra large bead on the front, so anything over about 50 yards the bead would be bigger than the vitals.