Aside from the split casings and possible extraction issues, are there any other reasons not to use 22lr in a 22m revolver?? The reason this came up is the SP101 in 22 currently is.a.22lr only. I figure it will come out 22m before anything.else. My single six is fine.with both cylinders but S/A only. I have put 22lr in the magnum cylinder before not paying attention. It ran fine, had 1-2 cases not stuck but split, and seemed ok. This was a while ago. I started thinking about it. I think it is plenty accurate for me using 22lr in the gun with a 22m bigger capable barrel. I understand the round should fit the cylinder correctly. Do people run 22lr in taurus or smith 22m revolvers?? Thanks,