What exactly is a practice rifle?
I understand the concept. I want specifics: rifle, caliber, rings, scope. suppressor, modifications...
What does it cost to build one?
Does anyone want to sell one?
The rifle platform can be whatever you prefer; Tikkas are just hard to beat.
The best cartridge is a 223. Cheap practice ammo can be found, or you can reload for it, and it will last for a lifetime for most folks.
Rings, I prefer tall rings from Unknown Munitions.
Having matching scopes on your hunting and training makes the best sense, but you don't have to. Maven, Trijicon, or SWFA. Check out scope evals in RS for more information.
A suppressor is not needed, especially for a training rifle, as you should be wearing ear protection while practicing.
Replacing the factory stock with something better will improve your shooting. The Rokstock is very nice, again, it's best if stocks match, but you could swap your training stock to your hunting rifle before hunting season.
The cost will vary depending on the quality of components and if you buy everything new, but plan on spending $1200-$1500 for a rifle, optic, and rings for a lower-end trainer with new parts.