wknitro;
Have you checked the "Bore" diameter of that bbl that uses the .348" bullet. Realize when the proof house stamped the bbl they stamped the Bore dia, not the groove/bullet size. A .338 bore for a .348 bullet would sound about right to me. My 8x58 Sauer has more difference than that & it was proofed for Stl Jacketed Bullets, not lead ones.


Miller/TN
I Didn't Say Everything I Said, Yogi Berra