Welcome to the forum!
You should have a stagger-feed action--the mag box stays attached to the receiver when removed from the stock. You could order a stock from Boyds or most any other place will have stocks to fit the action, just make sure it is top bolt release when you order(your action should be IIRC) as my 96-97ish action is. Ive not messed with the DBM setups but a lot of guys on the site have and will be able to direct you better than myself, but if Ive read most stuff correctly, with that bottom metal the stock will need to be inletted. CDI(one of our sponsors here) will do it, and they have a pretty quick turnaround I hear. As far as later stocks not fitting....I'm not sure about that provided you get Stagger-feed stock vs a Centerfeed one. Also, one more thing before I forget, I don't know the COL of the cartridge you will be building, but if they told you the 338LM mag will work it must be a Long action length. Make sure your action is a LA cartridge(270, 30-06,etc) your action is prior to actual short actions. Savage used the same numbers 111, 112 etc but would machine the bottom of receiver to hold a SA(243, 22-250, 223) box but it was still a LA(same LA spacing). It wasn't until several years later they came out with actual SAs 110, 112, etc.
I hope this helps some.
Scooter
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