I was going to say I think those strikes in the pictures would set off primers. Many put spring kits in the revolvers and that can very well cause light strikes. Also make sure the screw is tight on the spring.

It's nice and tight, and it doesn't look like anyone took a file to it either. Was thinking maybe it's a reduced power spring, however it does not appear that the side plate was ever removed. If it was, at least it was done right. Every screw on this gun except the grip screw, and strain screw looks untouched by screw drivers.

Really, I dont believe this gun was shot much at all. It was for sure, when I bought it, there was lead residue in all of the chambers and the bore, the cylinder has a turn line, and someone took the time to replace the magna grips with Pachmayrs. I really wish I knew how much.

What I do know is that it came out of a local collection along with some other neat pieces I've grabbed recently. The seller is down-sizing, and selling off his stuff a few at a time. Out of it, I grabbed a 1947 K22, this model 28-2, a 38 M&P model of 1902, and possibly a 38/44 HD (not sure if this one was part of the collection or not). The latter two were in tough shape, shootable, but not really to my liking, so they were traded for other guns. The guy also collected antique Colts, and High Standard stuff too. There were boxed examples of many HS target pistols, and at least one of every version of the Colt Woodsman that caught my eye among others.

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Here's a quick way to test/fix your mainspring strain screw if you think reliable primer ignition may benefit it being a tad longer.

Knock out a fired primer from a case. Remove the small anvil in the primer cup. Take a small flat tipped punch and flatten out the firing pin indentation. Back off the strain screw enough to place the primer cupped over the end of the strain screw and then tighten the strain screw down.

If it ignites primers reliably and doesn't create an excess amount of trigger pull weight you can simply leave it in place. If it does create an excess amount of trigger pull weight you can adjust the screw back out slightly to see if there is a sweet spot somewhere before it once again becomes unreliable.

If you find you still need more than the primer cup's material thickness for reliable ignition you can always add a shim in the bottom of the primer cup without worry of it coming out once everything is screwed back down.

It might be a simple way to diagnose (and possibly fixing) the problem before buying another strain screw.