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I could have made a fortune mining copper from my Trueflite barrel. Eventually settled down but took a couple of hundred rounds. Shot OK.

If you want velocity then barrel life will suffer. The smaller capacity cases will give slightly more barrel life. The bigger thing will be how you shoot it. Long strings of shots will eat the barrel...

7mm practical is the 300 win mag necked down and shoulder changed. Better than the rem mag, but behind the RUM. I think it is around 80ish grains of capacity/powder.

BC

7 RUM would be good, but you won't fit one in the magazine. Maybe if you extended the magazine a bit. When I had my 7 RUM I used the 180gr Berger hybrid. I had to single feed it, I hadn't extended...