Thread: A question for the doubters

Man this is turning into a science lesson , enjoying the read .

Now I’m no scientist but a .223 is 5.56mm dia and a .260 is 6.5mm dia. …that makes the 260 17% larger in diameter , so for a 260 to be equal to the 80gn ELDX performance you need to make the projectile 17% heavier which is 93.6gn , pretty light .

So if jacket dimensions etc. are all 17% bigger do you need to be going 17% faster also with a .260 to end up with same performance as the .223 ?