Is that really the reason they shortened the .338 win mag? seriously? so how much extra velocity would a .338 win mag get if it was full lengthy of the .300 win mag?
I think that's the stupidest reason I've ever heard on why a cartridge was made shorter
If you neck down a 338 case to 30 caliber you have a 308 norma mag also know as a 30/338with a teeny tiny difference. Not a lot of younger shooters know about these and I am sure it had a lot to do with Winchesters decision to make the case a bit longerl.