.22 Rimfire as a Personal training tool.
Most adult males think of the .22 Rimfire as a beginner's firearm. However setting up a replica of your hunting rifle in a .22 rimfire for practice is useful.
I have near perfect replica's of centerfire Firearms in rimfire, the problem is you can not just buy them off the shelf. You want the weight, length of pull, optic, everything to be as close as possible, and it is point-less without a first class trigger in the rimfire rifle.
If you had a center fire rifle you wanted to replicate, we could discuss that here.