If you have a very nice pistol vise, expect 1"with the right load. By hand off the bench, maybe like virginia7 said. A pistol like that can produce 2" off sandbags at 25 yards. I can't shoot 50 yards with a pistol to save my life. Can't see. Open handed, depend on you.

Also, if you get bad groups, consider your cylinder. There's always one that seems to not want to shoot and give you flyers.