Best wishes for a speedy recovery mate.

Had a 9mm from a Sterling SMG come back at me in my army days on the 25m range. Only noticed it when I heard a clang from the hand rail behind my firing point.

The backstop was made of old railway sleeper type material and I'd hit an old steel bolt in the wood.( which should have been removed Mr Range Safety Officer!!! ) Just goes to show it can happen to anybody anywhere. No telling what will happen once the bullet has left the muzzle.

Chin up and get well soon!!!