Re: blasting smallish tunnels in hard rock

Thanks Peter for explaining all this to our across-the-Atlantic cousins.
Very much more restrictive here.
It is so normal to go up to the counter at the club and buy a box of
rounds for your host's handgun you are going to have a go with - in the
sense of being repectful of your host's hospitality - normal in the US.
Not here.  No part of any of it is permitted.

Black powder licence to have typically a kilo provided you are a member
of a registered firearms club and have a firearms licence is fairly
readily had I gather.