Obtunded, if you can get the extractor, Mick will be able to open it up for you. Very simple process. Now if you want an oversized bolt body, that would be a different story. Hard to imagine PTG wouldn't make a Lapua oversized bolt given the hysteria around this chambering.
Glo7, in case you haven't looked at the ballistics of smaller cals, it might surprise you at how far and how well these work. I have my own 338 Monster so don't me get wrong, been there, had one built. In fact, I have built LR boomers in every suitable cal from the 338 to 223.
I now spend alot more time shooting smaller cals just as far, just as accurately, and not much difference in wind drift.
Of course, if you are trying to lay a hurt on something, bigger better. If you are just LR plinking, the 338LM may just prove to be more fun then you bargained for.
And in the world of 338's, the LM is not the best option if downrange horsepower and performance is you goal...
Jerry