Put a recoil pad on the gun and shot regular loads. My 7mm Rem Mag with a "Hi-Viz" recoil pad kicks less the a 243 (felt recoil, that is.) I was suprised when i first pulled the trigger and the gun was quite nice to me. increadiable considering that i was loaded up with 70 gr of RE22. This is my suggestion.

Another thingI saw in another thread,but dont know what to think about is; Let him shot the managed recoil stuff for practice and firearm familirization, then just remember where the 'real' stuff hits and plan accordingly. Then on hunt day, swap the loads out. He wont notice the recoil when squeezing of on a deer! just my sugg's