I'm in the middle of building another 7x57 on a M98 using a 20in barrel, timney trigger, sunny hill bolt shroud and Hogue rubber stock. I like my rifles on the short side, only thing I would change in what I'm building is to go longer on the barrel. The good thing about going with the 7x57 is that it will feed like it should. 308 might give you some grief, but 30-06 will work as well as most suggested. Easy to say, but go with what you like, throw it out there and let everyone give opinions.