I agree with D_the_D about rough bores. Certainly try it first. I have one, a Jeffrey Rook rifle that's been re-chambered to 25-20. To look at the bore you wouldn't think it would keep rounds on a big target at 25 yards but it will cloverleaf the first two shots at 35 yards and sub-MOA at 50, open sights, benched and bagged. The first 3-4 inches in front of the chamber are literally toast, simply awful.