My first go at it was average at best. I took my shooting rest, and used my fist at the rear. My first few shots were pretty bad, but after I got the feel of it, I did OK. I ended up with a score of 216, but my first target accounted for almost half of the points I lost. After watching the other guys, it became apparent that a Caldwell tack driver bag gives one a decided advantage, because it supports the entire gun at the fore-end and does not allow the butt to move freely. A little bit of adjustment leaves the gun essentially bagged in tight, allowing the shooter to eliminate that part of the variability.
When I go again, I will have a Caldwell bag.