I have built 4 mausers over the years. Two are .338 win on VZ-24 actions dated 1937 that I use here in Alaska for heavy stuff. One 7x57 on VZ-24 with #1 profile 20 inch barrel that weighs 5/13 with scope that I use for sheep. One 7x57 on a 1948 Yugo short action with a 20 in FN barrel circa 1951 intended for the Venezuelan Biathlon Olympic Team..hand lapped and polished at FN in Belgium... I don't know what I'll do with it.
I had all actions heat treated by modern methods. All were rebarreled. On .338's, bolt faces had to be hogged out to fit cartridge bases, upper rail of actions had to be relieved extensively for feeding to work, magazines had to be reworked for proper feeding. On all 4, bolts were polished and lugs were hand lapped, then surface hardened. Firing pins and springs were replaced with faster,lighter units. Triggers were either replaced with Timney, or reworked for smooth single stage pull (like butter). Safeties were altered or replaced to lighten pressures. Bolt handles were all forged to longer slender butterknife shape to reduce weight and allow gloved hand operation. Then drilling and tapping and replacing some parts. Then polishing and bluing. Then stocking and bedding (most important for a mauser). And then the little details. An old gunsmith did the heat-treating, bolt facing, and headspaced the chamber. I did all the rest, and it took time.
That being said, these guns work. No question as to whether an extractor will break or a firing pin break or a trigger not work or a safety not come off when needed. They are all more accurate than I can shoot. Over the years, I have had 3 very close-quarter brown bear confrontations and I'm still here.
Would I sell any one of my mausers ? NO !! Would I build any one of them again today ? Probably not. You can now buy over the counter almost anything that you want... a lot cheaper than you can build your mauser. And parts for mausers aren't as available as they used to be. And the old gunsmiths who know mausers are mostly gone. And I'm older too.
On the other hand, If you really like guns, and want to get up close and personal .... you won't ever like another rifle as much as you like your mauser. They are kind of the essence of what it all is about
Good luck