Interesting aye. Once upon a time perhaps but with modern powders and projectiles things change. Projectile choice is everything.
My .243 with 105gr targex has more energy out further than my .308 firing low BC soft points.
Shot over 200 deer with the .243 in the last couple of years with the .243 and my poor .308 has nearly been made redundant. Shot a fair few over 500 yards with it comfortably as well. Plenty of bang flops.
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