I am a huge fan of Private McKenzie in Her Majesty's Royal YouTube Light Rifle Regiment! If there's a guy that has more fun shooting old rifles I have yet to meet him.
I know the BPCR guys use cross sticks - but Private McKenzie has an interesting take on the rifle rest for field shooting:
https://www.youtube.com/watch?v=-YNadIao3OA
Fast forward it to about 6:43 - and see his portable rifle rest. What do you old hands and BPCR snipers make of that? It looks like it would be a fun winter project to keep the old hands busy while the snow and wind howls outside...