Cool project. While it many not be the cheapest way to get a Mauser 98 in 7x57 (I’m sure you could track down a factory chambered zastava) you’ll probably end up with a better barrel, fit and finish in exactly the styling you want. A superb round for all general hunting with more manageable recoil and bette SDs. Not knocking 8x57, just saying 7x57 is an excellent choice