I shot 3 position small bore in junior high and high school. I used the club's Remington 540 single shot .22. It had a target stock with the rail in the bottom of the forearm. So my left hand wore a thick leather shooting glove butted up next to the handstop and was kinda trapped in place by the leather sling. I could get really locked in, and it felt good.
I'm gonna need all the help I can muster judging by my targets I shot yesterday.

what is funny is that 3 position standing never used a sling, but from the pictures of other Appleseed shots I have seen, they actually teach and advocate the use of a sling while standing, plus to chicken wing the trigger arm.