Just wanted to add.....the 1903, o3a3 and 1917 do just fine with commercial ammo as well, no modifications needed. A few of us have been noticing that the 1917 in particular loves heavier ammo (168's).
Good to know. Dad has the two rifles in question and I know he's very much looking forward to some trigger time with them. I'll have to keep my eyes on CMP.