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August 20, 2019
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Occasionally I've had a light strike (@ 2 or 3 per 100) in double action with my 15-2 357 and a visibly shallower dent in the primer. Doing some research I found a thread about the mainspring seat screw that the grip screw goes into should be seated to one thread showing. The 15-2 I'm having the problem with is showing 2-3 threads vs the 1 thread on my other 15-2. Could this cause light strikes caused by the coil spring not being under enough tension and how do you turn it in? Will I need to take out the mainspring to turn it in? I tried putting two nuts on the grip screw, locked them tight, screwed the grip screw in till it touched the mainspring seat screw and use an adjustable wrench on the nuts to try and turn the seating screw in further. It wouldn't budge and I didn't want to damage the grip screw so I stropped. The next thing I'll check is the adjustment on the cylinder ball screw being flush with the frame. The photos show the difference in my two 15-2s spring seating screw adjustment. 
What say the experts here?
August 8, 2016
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Interesting. Hadn't thought about the mainspring seat screw. I've had light strike issues and part of it was an end shake issue. Too much front to back play with the cylinder. Need to use shims.
I'm assuming its factory springs? Previous owner didn't install reduced power springs?
My newly acquired 15-2 was getting light strikes in DA with the 8lb Wolff spring. Kinda bummed as I wanted to lighten up the trigger but I should check the mainspring seat screw. I don't think it's an endshake issue.
Dans Club
December 5, 2008
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Yes, you will have to disassemble and remove the hammer and mainspring in order to move the seat screw. Most of the 15-2s I have seen have the seat screw peaned in place by the factory. If it is loose you can probably move it with your fingers, if not, it may be loctited in place (probably by a former owner seeking to "tune" the trigger). You may be able to turn it with the grip screw once the spring tension is released. In any case, I'm betting you will figure something out!
Good luck.
NOTE: Before you disassemble, check the cylinder play. Your problem may be the need for shims. Too much play is the most common mechanical cause for light strikes.
August 20, 2019
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Thanks for the info. These light strikes were with my reloads which I primed with CCI#500 SPP so I should shoot some factory ammo too next time at the range. The more I think about it, if I didn't have those particular primers fully seated that could be why it took two strikes to ignite. I think I've read the CCI are harder than some.
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