I use a set of Vern Howey's shooting sticks.
They're the best I've found to date but good luck finding a set these days.
Charlie,
It's been a few years back but I called Vern because I couldn't find a place to buy his shooting sticks.
Told me he could build one for me, just give him the size I wanted.
I still have the number I used if you'd like to call him.
grrrr