Recently became the owner of a used Model 625-4 6" Revolver.
Had a awesome action which the seller said was done by a gunsmith.
Finally got to the range with full moon clips and factory Remington 230 grain FMJ ammo.
First eight rounds were one ragged hole. Then on the ninth, tenth and eleventh rounds--MISFIRES ! The primers had a very small dent .
Coming home and stripping the weapon, I found the mainspring and trigger return spring were "Wolffs"
Installed factory OEM mainspring and trigger return spring and planning another range trip.

i`ve had the same problems.

On close examination the Wolff Mainspring appears to have a pronounced bend in it ?

Sounds like someone was trying to adjust the firing mechanism. I'll bet the strain screw was either backed out or shortened as well. I wasn't aware of a 6" model 625. Never had a problem with any Wolff springs.

There are 2 versions of Wolff mainsprings. The regular one and the light one. They are the same spring, the light one is just bent to have less preload. If you bend it back straight, or unbend it, you have a regular one.

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Jimmyj

I would reinstall the wolf springs and tighten the strain screw and perhaps apply blue loctite,,, for some reason stainless does let the screw backout rather fast, this has happened to mine several times after the LT problem goes away.

The strain screw has a Alan head. Is this OEM or an after market ?

Model 625, 6" are commonly used in pistol games where lighter than factory loads are used. Lightening the trigger pull is also common as you have discovered. Many reloaders will use Federal primers which will ignite at lighter hammer hits.

Changing the hammer spring and strain screw back to "stock" should eliminate the FTF'S!

Smiles,

That is not a factory screw.

If it id shorter than an OEM strain screw, that is a contributing factor

You can probably leave the springs alone and just replace the strain screw

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No need at all to replace the rebound slide spring as long as the trigger is resetting well. It can not cause a light strike.

Competition revolvers are sometimes set up with a set screw instead of a normal strain screw. The idea is that you can adjust the tension down until you get misfires, then go back up maybe a half turn and have reliable ignition with minimum weight. If yours is set up like this, tighten the screw until it's reliable, then locktite it in that position.

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Mark

It sounds like your revolver was tuned and was prolly used with Federal primers. You can untune it by getting a factory S&W mainspring and a new strain screw.

If you have any stock strain screws you can compare the length. Those springs are stock in the in the PC 625-8. The rib sometimes in effect shortens the screw. I needed to make a longer screw (slightly) to get totally reliable ignition.

Jimmy was it perhaps the moonclip causing the issue? Did you set the unfired rounds in another moonclip and try them or were you reloading same clips?
Karl