Most of us have fired a considerable amount of factory loads in our Krags with no ill results. U.S. commercial loads have long been designed for the pressure limitations of the Krag.

IMHO - 'bedding problems' cause most stock cracks - too much tension on rear trigger-guard screw, bad fit of rear of action in stock, or no barrel-band (which allows barrel to lift and torque stock).

I disagree with your gunsmith.

Most Re-Loading Manuals give good data for the U.S. Krag.