Wow some are worried about .22 magnum pressures in a k-frame!? Yes a slightly undersized barrel too, shivers. Get a grip folks. Any quality firearm can handle this conversion. A .22 Magnum chamber reamer is all that is needed. Off course now you just have a .22 Magnum. Just think how often one wishes to shoot .22 Mags? If it’s worth it to you, do it.
This conversion is also regularly done to the Ruger Bearcats that feature a tighter bore size than the single-six.