Purpose built practice rifle

[Salmonchaser]

I would try to match your duty rifle as best you can. Don’t over look the value of dryfire. Most high end competitive shooters do a lot of it. Fire one dry fire five kind of thing can work wonders. This will allow your rifle to cool as well.
If you’re working with a spotter he/she can load the rifle for you. You won’t know if there is a round in the chamber or not. This drill will teach you very quickly what may be lacking in your shooting style.
Make it fun, get off the bench and challenge yourself.

 

[Caseknife]

Build a fluted heavy barrel 6 ARC, that way you can hunt with it also if you feel so inclined.