I have customs built on both actions.
My US Model 1917 made by Remington (called an Enfield, but they aren't really...) had the "ears" turned off and the rear bridge contoured to match a Remington model 30. A #6 Douglas XX AG barrel was affixed, with an original MagnaPort brake, and chambered to 300 WM and housed in a bedded Fajen stock. Bottom metal was straightened, and the whole thing blued up. All that was back in the late 70s/early 80s. I bought the rifle from the former owner's widow. I then installed a Dayton-Traister cock-on-opening conversion with trigger. Leupy 4.5-14 AO w/ M1 turrets. Shoots about 0.5 MOA out to 200 (haven't gotten on a longe range with it yet...). The stock fits me very well, in fact feeling like it was custom made for me. All up w/ bipod and 3 in the mag it goes 12.5lbs, so not a walking rifle...
On the Mausers, I have a 338 WM and a 6.5-06AI, both of which are built on VZ24 actions and are MOA or better shooters. I'm building a 35 Remington on a Kar98a action right now (it'll end up with a can on it more than likely). I've got another VZ24 action salted away for a future build TBD...
If you can get them bought right, they'll make fine sporters. You won't save any money on them versus using a commercial action, but it can be fun nonetheless. In my experience, they'll shoot pretty well, too!
Have fun,
Brian