I should add, probably the most different rest I have used so far was my wife.
Shot was around 335 yards, but I could not get steady enough sitting on a slope after a fair jog to get into position, so I asked Carolyn to lay down in front of me, tossed the forearm on her hip, and told her when I was close I'd say ready, she was to stop any movement...
Bingo. First 10 point of my life, first buck with a new 7x300 wtby that Mickey built...