Here is all 3 sizes. The long rifle and short have the same grips. But north american arms sells this oversize slip on grip that fits either one. To me, it made all the difference and makes it very shootable.The standard NAA Mini comes in 3 frame sizes. Short, LR, and Magnum. If you have large hands the short and LR may not work for you. The issue is not the gun but hand fit. I had the LR frame. When I would grab it fast the trigger would fall in the knuckle of my finger and I could not pull it. This means I could not trust it for carry. If you have smaller hands they work fine. The guns are good. I have moved up to the Magnum frame with the conversion cylinder. She fits perfect. She will fire short, LR, and Win mag. At the range every one laughs at her. When they shoot her they stop laughing. For you black powder guys the LR and Mag come in a cap&ball version! I have one. https://northamericanarms.com/firearms/ --- One like mine.
You said you had moved up to the magnum frame. Even with this oversize grip it is still much smaller than the magnum frame.Like putting tractor tires on a VW Bug. Fun but the entire point of Mini is small.
Because the 22 Short version is even smaller than the LR version.Why buy a dedicated 22 short NAA revolver when you could buy the long rifle and have both options?