Not figuring bolt face sizes, how many different action lengths are there? Model 7, 700 short and long? Is there a magnum length or is that just a long action?
Short and long. And some will say it will and some will say it wont. You will need a new bolt or have your face opened up on your current bolt, but i would recommend buying a new one from Pacific tool and gauge. As long as you are a safe knowledgeable reloader it will work just fine, you try and push the limits of the 338 lapua and you will run into problems.
Be sure to remember, the bolt face of a lapua is the big bolt face. Same as the 338-378. Also, if you plan to use the magazine, you will definately run into trouble with 338-378 and the edge (its .100 longer) and can run into trouble with the 338 rum and lapua.
