How well you can group from a bench rest is only relevant for varmiting.
You need to know how well you can shoot from hunting positions, in hunting conditions (wind, dust, etc.) and with some adrenalin or fatigue in your system.
I think plinking ("recreational shooting") is a better preparation for hunting for that reason. Plinking in informal competition is probably better, because it adds some pressure to the equation.
Plink away.