No, believe it or not you can't safely use the modern British 3" magnum cartridges through it either. The modern British 2 3/4" magnum round is o.k. though. Either that or load your own. I have two with similar proof marks and make my own 1 1/2 ounce 3" ammo for them or use factory 2 3/4" magnums with the 1 1/2 ounce of shot. Lagopus.....