My dad has reloaded his own shotgun shells in the past for squirrel hunting. It's been a while since he has and he was using the Green Dot powder. He's off on medical leave due to having a pacemaker in so he's going stir crazy and wanting to reload some shells but cannot find the Green Dot powder. What else can he use to reload 12 ga loads for squirrel hunting? I know absolutely nothing about reloading to try and even help him.