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In the early days of Ruger single sixes, apparently they had some concerns about barrel diamater. They made the 22lr and then a dedicated 22 mag only version. Eventually they came out with the .22mag available with a fitted .22lr cylinder, and then on to the currently type of convertible as we know it today. I would guess they stayed with a slightly larger bore diamater in the current type of convertible. I have seen more than one conversion of different guns of the years from Lr to mag...including a pretty popular conversion of some of the Winchester pumps from 06's to 90's.
I doubt you will have any problems with yours...
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