You absolutely have to make the effort to use the same grip tension irrespective of the position/rest you are using. You don't want to hold the revolver differently offhand than you did when you sighted it in off the bench.

This is an instructional video I did for Gun Digest TV, that explains the method I use. It may not work for you, but you need to experiment and come up with a method that will work for you.
Max Prasac

Semper Fidelis


Gun Digest TV's Modern Shooter: