The first rifle I ever built , had a Montana .40 cal. 13 \16 42 inch barrel. It was a very nice performing barrel . Shot deer , groundhogs , rabbits , squirrels with that rifle . My sister , who had little experience with rifles other than a .22 , was able to shoot a couple of groundhogs with it at ranges up to 60 yards . We had so many groundhogs during the 80s , that we almost got tired of shooting them. We still are pretty flush with them now! Wished I still had that Montana barreled rifle , it was a shooter!. Nate