I set up the brass for the chamber the same way as you, eagle, with belted or rimless - you have to if you want it to last - just don't like them. The belt is not needed - it's superfluous, redundent.

The 7mm Rem. Mag, is one I've never really liked - even though I've had a couple - have one right now but I'm thinking of pitching the tube.

The case capacity is too much larger than a .280 or the 280IMP which matches it, ballistically. It's the efficiency I don't like - and the belt, did I mention that?