Welcome Brian

Just to add a bit (only a little bit, but I reckon it's important) to MattW's post, I copied this from Post #22 from John (pennineway) - way back at start of the thread

" The disciplines are shot unsupported (by that I mean no part of the body can touch a table or bench etc)

It also goes without saying that it must be shot one-handed

The disciplines are shot using .177 only (.22 are not used at these 2 distances) "

and, of course it's STANDING.

Added this last bit just in case you thought that prone (even with your toes behind the line) was OK. If you were not aware of this, and if you happened to be 7' tall and with long arms, you'd have something approaching a 2 1/2 metre advantage