RE: .22 mag: Worth it?
If you can chronograph the .22 Magnum cylinder, I think you will find you are getting way less than the rated velocity the cartridge is capable of in a rifle. Louder, but not neccesarily more power, or at least not much more than .22 LR. Interchangable cylinder revolvers are also producedwith a compromise bore/groove diameter, and are often not as accurate with .22 Magnum as with .22 LR.
If you like it, no problem. I don't think it is worth the extra ammunition cost, but that's just me.