This is my first post on this site and I know this is a old post. The .002 in bullet size is nothing. I measured a hand full of 22 mag rounds not one was .224. .221 - .223. I'm not seeing how there is a higher pressure because a lr uses a higher burn rate powder. Where the magnum uses a slower burning rifle powder. The local gunsmith reamed out all 6 cyclinders on my 617. With a 22 mag reamer. If the machine work is done correctly there should be zero risk. The frame is designed to shoot bullets with 5 times the weight. The side wall on the barrel is thicker than the side wall on my ruger 10/22 magnum rifle. If you add up the real time facts there is no risk.