Americans love to re-invent the wheel when it comes to cartridges, some of them very short lived on the market and very few of them better than the venerable .30-'06 when it comes to dropping game.
Men like Teddy Roosevelt, Grancell Fitz, Townsend Whelan, Jack O'Connor, etc. proved it's worth on all kinds of dangerous critters with the original 150 gr load at 2750 fps.
A huge increase in case capacity with a Magnum for the sake of a marginal increase in velocity and increased muzzle blast and recoil. Makes perfect sense - NOT!
A pal was at the range chronoing three .270 loads for an upcoming moose hunt. When he was finished I asked him what load he had settled on. Answer- "The fastest one, of course." I asked him the difference between the fastest and the slowest and it was something in the 100 fps range. I asked him if he thought an animal he hit would know the difference.
He asked me what load I would have chosen as he knew I had a .270. Answer - "The most accurate, of course." I got a blank look ......