The "one powder" idea is a novice concept that never really works.
Don't let him begin on the wrong path. As previously mentioned he should have at least two different powders for the above rifle.
He could do a lot with H4350, but that presuming he can even find any right now.
What's he going to do for primers?
Are you going to give him some, or is he going to pay $500 a thousand on Gunbroker? If not powder don't matter because he's not going to be reloading anytime soon.
Last edited by antelope_sniper; 01/08/21.