Well,
I think, as a general thing, if you're a member of any of the shooting bodies-- NRA NSRA etc etc -- you would be covered for all shooting related accidents.
In fact, the NRA insurers specifically mention hand loading, and, incidentally, cannon use
I couldn't comment on others.
Bit of a fag, I know, but you/ he/ all of us should join one of our shooting bodies. I don't want to get in a harangue over which one--- they're not all equal, you know!
He/ we/ all of us need to stick together.
Ps his club needs to get a bit of a grip with reality.
All the best,
David