Which Mauser action? Is it a 96 or 98? If it's a German 98, or a CZ or Zastava, Ruger or Win. then they are very good.
As for the caliber, if you plan to hunt any deer size game or even larger get the 6.5 x 55. The Swede has a wide variety of bullets to choose from, and their B.C's are very high. I shoot only 120/129 grainers in mine. But most guys go with a 140. Heck you can even get 160's easily.
Right now I use mine (a type 96 made in 1942 by Husqvarna) for javelina and coyotes. But with the right bullet (like a Barnes X,XLC or TSX) I would even use it on elk. Most people would not say the same for the 243.
Also, it's pretty easy to reload for.