You sacrifice some ability to shoot groups with low power magnification. My 6x45 will shoot under a 1/2" with a 12x but I have gotten several groups under and inch with my new Weaver on 3x. Both my mounts are good enough quality, I think I might be able to swap them and maintain proper POI. I have a Weaver V3 in a Burris PEPR, and a Nikon 3-9 Buckmaster in a RRA cantilever. I'm thinking about getting my Nikon 3-9 Buckmaster sighted in on my 6x45 also and then switch out the two scope/mounts as the situation dictates.