I have had this problem with my 625. My problem is caused by the ejection rod comming loose. I need to put a little bit of locktite on it, but have been to lazy to try.
I have three revolver (SAA) with the same barrel length. There is a difference of 150 ft/sec between the fastest and slowest. The velocity varies directly with the size of the barrel to cylinder gap.
All load velocity data applies only to the test gun that was used. Don't expect to get the same...
Shoot some at paper to understand your grouping. However, also shoot at "fun" targets that help keep your mind off the recoil.
When I shoot at steel "cowboy" targets, the pistol is a lot more fun to shoot.
With three single action army pistols, I consistantly see about a 50 ft/sec variation in average velocity between the three with the same load.
This variation correlates with the size of the barrel to cylinder gap.
With a revolver, the only way to know actual velocity is to measure it.
I have a new 642 with laser sights. What is the best form for shooting with laser sights? I find myself point shooting with the pistol a few inches below the line of sight between my eyes and the target. How do you do this?
Simple, a proven man stopper, the 45 Long Colt with a 250 grain bullet and the case full of FFF black powder. If you can't stand the smoke, go to the more modern version which is the 45 ACP with a 230 gr bullet powered with smokeless powder at around 825 ft/sec.