I have a 629-2 Classic which is almost identical to your revolver. It also has the 8 3/8" barrel. The accuracy of that revolver has really surprised me over the years. It was much more accurate than I expected. I've never used anything but the irons on it even though mine is drilled and tapped. I can rest mine against something on the side like a post or a tree and it will shoot plenty accurate like that. I can bounce a gallon jug around at 175 yards with it. I saw another 629 match my Sig P220 shot for shot at 25 yards shooting with no rest of any kind. People laughed at me at first when I moved the 8" steel target out to 25 yards. They had been shooting it at 7 yards and they thought I would never hit the target at 25 yards. When I started hitting it about 9 out of 10 times I started drawing a crowd. Then someone got the range master to challenge me. He was using a 629 with a 6" barrel. We were matching each other shot for shot until I ran out of ammo. When he saw me bring my own 629 out of the truck he suddenly decided it was getting late and time to close the range. Yeah right. He should have kept shooting because I had only just acquired that Smith so I wasn't nearly as good with it as I was the Sig. Still he shot his very well and kept up with me when I was using one of the most accurate pistols of that era.