I say the 100 year-old .30/06 is the way to go. You can get almost 5 boxes of surplus ammo (100 rounds) for practice for that test to one box of flinch inducing .300 WN (with and without the muzzle brake). When you are good enough switch to your hunting load (180-220 grn. SP Premium ammo) and practice with that. You should be good to go.