Re: Which 338
I have built a few Lapua's, and alot of Edge's for customers and I use an Edge myself. From what I have seen, the 338 Edge will out perform the Lapua by a slight margin, all things being equal....barrel length, pressure, etc. We usually get 6-7 loadings on the Remington Ultra brass, and the Lapua guys might get 7-9 loadings. The Edge is easier to build on standard Remington actions, where the Lapua takes opening the bolt face, adding extractors or a custom receiver.
I am a big fan of the Edge, but the Lapua is no slouch either. We run 300gr SMK at 2920fps out of our 31" barreled 338 Edge's...most of the 30" Edge's run 2820-2880. The 30" Lapua's I have built all top out at around 2800-2830 with the 300SMK. I know you can push them harder, but at what price????
Either one will get to extended ranges...pick one and have fun.