I have a Beretta 689 O/U in 9.3x74R with spare 20 ga barrels. They also made that model in 30-06 and 8x57R, but I really wish I could find a set of spare barrels in either 7x57R or 7x65R. My next choice would be 8x57R.

I have used a 7x64mm as my go to gun for many years and have taken lots of deer from roe to red deer, always reliable one shot kills.