Guys new to this, I bought a 625 JM, several years ago, did a trigger job on it, use Federal pimers in the reloads, and even tried factory ammo, put a longer firing pin it it, but it stillm won't fire every time, thanks

Bought it new or used?

Did it have this problem from the start or only after you did a "trigger job"?

What did the trigger job consist of? What was altered/replaced?

Using moon clips? What type? Try 45 Auto Rims?

Failure to fire on SA, DA, or both?

What length was the stock firing pin & what is the replacements length?

Let's see what answers you can provide & maybe we can help.

.

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Waiting for the break of day

If you bought a used gun, see if the strain screw is tightened all the way down. More likely, the previous owner filed it down to get a lighter trigger pull. If you bought it new, I've wasted your time. Sorry.

I've found that without a few related modifications the best compromise for shooting and reliability is a 2 1/2lb S/A and 8lb D/A pull measured with a trigger pull scale. Any lighter and reliability suffers. Certainly with more work and parts this can be improved on but with just stoning and springs this is the best compromise I've found. You might want to start by measuring your trigger pull.

Check the strain screw to see if it was shortened. A new 1 is an easy fix. NEVER had an issue with my JM. Every thread needs pictures. SO...... Bob

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^^^^what he said! My ?: did you ever fire this gun "factory stock?" That may help provide an answer.

Kaaskop49
Shield #5103

Even if bought new the strain could not be tight. I saw two 628-8s PCs come from factory with strain screws backed out almost two turns. Light strikes until the strain screw tightened then never failed afterwards.

Excellent advice for anyone with a new gun.

Was the stock mainspring swapped out with a Wolff spring with the "power rib"?

If so, that rib indentation makes the strain screw too short to properly load/tension the spring and you will get light strikes.

The fix is to install the longer length strain screw for a square butt gun.

I went through this with my 625-8 JM after installing a Wolff spring.

Shortly after getting the 625-8, I bought a 986 Pro Series gun that comes with the "Performance Center" mainspring, out of curiosity I opened it up and found that the PC spring looks suspiciously like a Wolff spring (rib and all). I saw that the strain screw looked different from a regular round butt screw, and I recognized it as a longer square butt screw installed by S&W.

So I changed the strain screw on my 625-8 and problem solved.

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Conrad
SWCA #1830 SWHF #222