If I had a nickle for every lead round I have fired thur a GI 45 I could retire yesterday, or at least today. I have never heard that it was blasphemous, or bad or wrong to shoot lead in a GI gun. Just because the military does it different sure dosent make it right.
If someone is telling you not to do this, then I suggest that you allow them to furnish your ammunition. Have a good 'un