I usually qualified twice a year with a Sig 220, a Colt Commander, a Glock 23 car gun, and a S&W 642.
I would shoot expert with everything but the 642. I barely qualified. I think the range officer would cut me a break once in awhile.
I began to blame the snub barrel for its poor accuracy, but when a detective stopped in to qualify next to me, he shot a perfect score with a 642. With admiration, I watched him do it .
When I asked his secret, he replied, "Lots of practice, like your life depended on it!" And then he proceeded to take out his Bar-Sto barrel Commander and shot one 4 inch ragged hole in the 60 shot qualification
I immediately sent my Commander out to Irv Stone who made and installed his barrel in mine. ( correctly installed custom barrels DO make a difference).
I believe the 642, even with Craig Spegal boot grips, kicked much harder than all of my other pistols.