Sach, I generally rest my wrists on sand bags when sighting a revolver in. AFTER that I try to do all my practice from FIELD positions. The blast from the barrel/cylinder gap can and will shred a sand bag. Once I'm in the field, I use what ever is available for a rest. Trees, fence posts and big rocks have worked for me in the past. I have even draped a glove over a branch to rest the trigger guard on. You are talking about SHORT range shooting though. I'd do a LOT of off hand shooting in case I needed to take that quick shot.