so I'm going to be starting a 338 project rifle later during the summer when i actually have some money coming in. the good folks over at snipershide have already talked me into spending a good deal on the project and i aint complaining. i started out thinking about a .338 lapua but now that I've decided to step up everything on the gun i started thinkin why not step up the round itself. 338-378 was my next thought then started thinking lapua improved. my next stop was allen xpress. so will 338 AX work in standard lapua AI magazines? do they reliably feed with the steeper shoulder? does anyone have experience with case life using lapua brass? I've also read that there are dies available is this true? thats all i can think of for now at least. thanks for the help!