I accidently bought a tin of the non-magnum CCI caps last spring. I shoot 80 gr. 777 in my Pedersoli Frontier. I did not notice any difference in the point of impact.

What I did notice though was that I had two misfires. Both times I tried a second non-magnum cap and it still refused to fire. So I put on a magnum cap and it fired. To be fair, I had already sent maybe 30 rounds thru the rifle, so maybe the nipple was getting real dirty. But the magnum cap still ignited the powder without me touching the nipple. I took the non-magnum caps and threw them in my black powder revolver supplies box; I'll use them up there.