ORIGINAL: Doe Dumper
Dont forget.....this may not make a big difference but the 338 bullet has a little more surface area than the .308 at the base of the bullet to be exposed to burn thrust. Not a scientific explaination of course but it does make a difference..lol. Kinda like a flat base bullet making more velocity than a boattail with equal powder charges?
I don't know about th flat base vs boattail comparison, but you can push a bullet of a given weight faster if it has a bigger cross-sectional area for the powder gases to push on. This was one of ol' P.O. Ackley's major arguments against the use of increasingly smaller bore diameters in the wildcat business.....