I shoot a 10" Fox Ridge ported stainless bull barrel. I ported it KNOWING I will propably re-bore it to the new 460 S&W. It has very little muzzle flip with the ports and comes straight back. I did make a mistake on the rings, using the standard Weaver rings. I use the standard 4 hole Weaver mount and ordered 2 sets of Burris Signature Zee rings...I'll mount the scope (Bushnell Trophy 2-6) with 3 Burris rings. This thing is pure hell on scope rings,,,the 4 hole mount is fine,,,just use a 3 ring setup!!