I have a blue 5.5inch model. The only thing I have done to it was put a set of pachmyer presentation grips on it. The best .22 LR groups I get at 25 yards are about 2 ro 2.5 inches. I get 1 inch groups when I shoot the magnum cylinder with Federal 50 grain HP magnum rounds. All the other magnum rounds shoot the same or worse than the long rifle rounds.
But, still, a 2 or 3 inch group at 25 yards is ok for a field pistol. That will kill a rabbit, or bounce a tin can. And I like to pick off football sized rocks in the backstop at 100 yards with mine. I dont hit them all the time, but I always come close. thats a lot of fun.
When i want to drill bullseyes, I shoot my S&W41 or my TC contender. But they get boring fast. The single six blasting away at cans, or rocks, is a lot more fun.
Actually, at my range in summer, we get these large grasshoppers that hop and walk across the sandpit that our range is made up of. These guys are about 2 inches long, and abut a half inch thick. Out tto 20 yards its we just shoot them. When we miss, we see the sand kick up where we missed. Other ties the grasshopper just dissapears. You can shoot the single six at these all day till your thumb is raw its so much fun.