I have about six or seven rifles built on Mauser actions. All shoot VERY well. They are not BR quality accurate but all capable or MOA to at least 500yds. The most "custom" of the bunch is a .30 Gibbs that is completely tricked...Shilen 25.5" tube, Haoland QD, Timney trigger, Boyd's stock, squared and the works. It will shoot sub-MOA to 500yds (longest range I have available).
Only shot one deer with it...445yds w/ a 165gr Hornady Interlock w/ MV at 3100fps.