Hey, good information here, although the weight of UP, bucks is what makes them special, not so much in rack size, the average distance I shoot bucks up here is about 75 yards, or closer,,,, with that said, the 243 is just fine,,,,, good bullet and shot placement, using a gun your comfortable with, will transmit into a gun your confident with....
I hunt Iron, Baraga, ............................... good luck