The battle will continue forever.....no one ever asks what amount of improvement there is between the .270 winchestewr and the .270 Weatherby with the same length barrels.....and the .270 WBY has a far greater powder capacity!
The same can be said for the .280 Remington and the 7M mag as well as the .30-06 and the .300 H&H...these enormous increases in powder capacity yields a surprisingly small increase in velocity and yet we have people stating that (assuming safe pressures within the saami specs) their .257 AI Roberts shoots faster than a .257 Weatherby!!!!!
If one chooses to delude himself there's little that can be done about it. I take great pride in having never built one.....that I listened to a guy that knew this years ago....hey...it's your money.....spend it your way!!!