First, don't ever shoot any of his reloads...
Seriously, your "friend" isn't your friend and isn't "great" if he can't/won't listen to you.
I learned from my girlfriend's father, and he was ex-mil and a no-nonsense engineer. I was in college (this is 20+ years ago), and I didn't have any money, so I used his equipment (Dillon RL550B!) while he looked on. I was scared shitless of him, so I did whatever he told me.
So, maybe try this: Let him load ammo using your equipment. Let him provide the components, but let him use your press, scale, bullet puller, tumbler, etc. etc. etc.
Hang out with him while he's doing it, and then when he has questions or screws something up, then you'll be there to set him straight.
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