Oh, this is an easy answer....
Rifle: Vudoo 22 LR
Ammo: Lapua Center-X
Stock: Manners EH1 (same as hunting rifles)
Trigger: TriggerTech Primary (same as hunting rifles)
Optic: NightForce 4-16x50 ATACR (hunting rifles)
A rimfire rifle that is practically identical to my hunting rifles. They’re all setup the same.....
Use the rimfire scaling tool (excel spreadsheet) that allows you to input the drop/drift of your 22LR and your hunting rifle....which then gives you the scaled distances that can be used for practicing shots from field positions. For example; you want to shoot the equivalent of 600 yards at an 8” target with your hunting rifle. So, you run the scaling tool and see that you need to be shooting at 150 yards at a 2” target with your 22LR. Now go out and shoot from various positions - prone, from your pack, off a tripod (sitting, kneeling and standing), from tree branches, rocks etc. Shoot from any positions that you could see yourself using while hunting. Also, shoot in the WIND.
If we’re talking one rimfire rifle, this’d be it....a hunting rifle trainer. Also, while your at it, combine it with a hunting centerfire trainer. Again same stock, trigger and scope, in a mild recoiling rifle with longish barrel life. Then hunt with a shoulder cannon (same stock, trigger and scope).
From my perspective, if the goal is to be a precision rifleman who is a lethal and competent hunter, you’re not going to get there by shooting 20-30 rounds a year. You gotta train. A rimfire trainer combined with a centerfire trainer is a step in the right direction.