RE: Weight vs. Power
I have 2 ways of looking at it:
1. carrying a heavy rifle over many miles is going to be much more uncomfortable and possibly painful than the momentary jolt of recoil you're going to take when you finally shoot it.
2. Its easier for most people to cut 5 lbs off their body weight to carry less around than to cut 1 lb off their rifle.
I think somewhere in between lies the answer.