Single 6
My Dad's came my way after his death in 2002, 6.5" tube, convertible .22lr/.22M, blue steel. First thing I learned, Dad had no where near a working zero with the .22lr cylinder in it, at least for me. Next, basically because I had all the .22 handgun I wanted in a MKII Standard model Ruger auto pistol, I put the .22mag cylinder in Dad's Single 6. It's been in there ever since. Finally, because of the longer tube, I shoot the 6.5" gun better than most all my other handguns.....I see the front sight better a bit farther out there.
The only load I can get the sights to adjust to is the original W-W 40 gr JHP or FMJ load. All other makes or bullet weights shoot high and there is not sufficient depression in the rear sight to get POA/POI. That bothers me not a bit really, the W-W ammo suits me fine. The cost doesn't bother me either, because as a woods/trail/pest gun, I don't shoot large quantities of ammo from it, .....22 lr in other guns serves that purpose.
I shot quite a few armadillos with the revolver in .22 mag with the JHP round, and the difference in killing power of the mag round over the .22 lr seems apparent. The mag round would also punch through various materials like sheet metal better than the .22lr, not that that was much of a measure of much use, but the .22 mag was clearly more powerful.
The gun rides in a flap holster, modified for cross draw, on a cartridge belt, I think both are from Triple K. Cross draw allows the long tube to get out of the way in the Bronco, or on the ATV. If I am not carrying a heavy handgun, the Single 6 in .22 mag is the one that usually still comes along.