To minimize the variables, I decided to shoot each gun on two tests from our Handgun testing Program that do not have a draw component nor timed reload component. Both tests start from the Extended (Low) Ready, aimed at the base of the target frame, i.e., below the subject’s feet.
For ammo, I used Bill Rogers' Bianchi Cup load, which is a 148 grain wadcutter by Master Cartridge that I have chronoed at 740 fps from a snub, yielding a Power Factor of 110. It’s not 158 +P, but it’s not a poof load either. I would have no problem carrying it in a snub for defensive purposes. It would cut a good hole and have adequate penetration. The speedloaders I used were Safariland Comp I and Comp II.
test #1 requires the shooter to engage the body and head of T1 and then engage T5 at the top of the wall. There are three separate runs for a total of nine possible points. The time allowed for each run is 1.5 seconds. Here is a link YouTube - Rogers test 1 to a video of the test shot with an autoloader. The only difference between the revolver and autoloader test is the length of pause between runs. While there isn’t technically a timed reload involved, the pause for revolvers is only six seconds. As a result, a J-frame must reload twice in under six seconds. A K-frame has to reload at least once in under six seconds.
Gun : Score
640-1 : 9
37-2 : 7
10-5 : 9
Doesn’t look like much difference, but there is more to the story. On T5, the group from the Model 10 was only 4 inches and well centered. The head of T1 was even tighter. The body shots on T1 with the M10 consisted to two overlapping hits with the third being about one inch away from those two. The group was centered over the aiming spot on the target. I couldn’t do that with either of the J-frames. The reloads were different, too. Even with wadcutters, reloading a K-frame is no big thing. I didn’t have any problem getting the Js reloaded, but it’s noticeably more work.
As a benchmark, 7 was the median score for this test on the fourth day of our last class.