300 mag?! What does he think he's on safari? You did say Georgia deer didn't ya? For those little things he's way over-gunned. - maybe a .22 short or good pellet gun (LOL - JJ).

You're on the right track. Start closer and have someone else along to donate a shoulder and seperate perspective. Some guys screw things up (literally) when they start cranking on adjustment screws the wrong way. Who knows what he's done.

Have to recommend some reduced recoil ammo for the next sight-in session to get close and then some fine tune with the actual choice for hunting.

300 mag for Georgia deer? I gotta remember than one!!! The boys will love it! LOL