Re: Remington M1917
If the gun hasn't already been bubbaed, I would strongly suggest you rethink using the rifle for an action. They do NOT make these anymore, and once they are all gone, they are all gone.
If it has already been butchered, then do the sporterization, but do it right and don't waste it.
Properly sporterizing one consists of a good straight drill and tap for a scope, cutting and crowning barrel if not rebarreling, restocking, refinishing, etc.
If you magnumize it, it will require precision bolt work to make it work, and more to make it work right.
I had one that was in .300 WM, and hated it, sent it down the road. I have one now that is butchered and will likely be a .458 Lott or .500 Jeff. they are a BIG strong action that do very well for Safari guns. My checkering had a gorgeous example in .495 A-Square.
The most popular sporterization upgrades were grinding the rear sight ears off and recontouring the rear receiver ring, and taking the 'hump' out of the bottom metal, something that requires excellent welding skills.