You can do exactly this, I did it and made a 280Rem
a 7RM will have a good muzzle blast and more recoil and a shorter lifespan.
but a good dose more velosity and in hind sight pushing a 162 amax harder and not having to pay for the gun smith, LA mag and bolt stop I should have gone that way. also the 7RM has a 2 inch longer barrel than the 7mm08 i believe
you also burn more powder and everything that you buy costs more, factory ammo, cases, primers
but that amax goes faster...............
run the ballistics. make your choice
either that or go 260rem with a 140 amax
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