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Old 10-09-2017, 07:02 AM
sw dan sw dan is offline
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Default 627 pro, up date 10/12/17

hi folks,
picked up a new 627 pro, and just wondering what is an acceptable trigger pull in double action? will have a friend check mine, but it is very heavy. thanks.....dan

Last edited by sw dan; 10-12-2017 at 06:34 PM.
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Old 10-09-2017, 08:59 AM
Chipperxd Chipperxd is offline
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I wonder if putting some rounds through it will lighten it up a bit.
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Old 10-09-2017, 09:28 AM
sdb321 sdb321 is offline
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Default ACTION JOB

I have a 686 Pro SSR. From the factory mine was a little heavy also. I installed a lighter rebound spring but was hesitant about reliability. I took it to a S&W gunsmith to have a deluxe action job performed. He replaced the spring back to stock and the trigger pull is now 9lbs. 13oz. I'm happy with the gun and my decision. Hope this might help you. Have fun, be safe!!!!
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Old 10-09-2017, 10:55 AM
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epj epj is offline
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I put a Wilson reduced power mainspring and rebound spring in mine and polished the bearing surfaces a bit. Had a nice smooth 8 lb. trigger pull, accompanied by a few light strikes. I put the factory mainspring back in. Someday I’m going to tinker some more. Probably get a couple of extra strain screws and shorten them just a half a tad at a time and see if I can find a happy medium without light strikes. I have a thousand Federal primers, but I have several thousand CCI primers. Don’t want a gun that has to have soft primers in order to work properly.
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Old 10-09-2017, 12:54 PM
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muddocktor muddocktor is offline
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My 627 Pro came with a Wolff type power rib mainspring in it that proved to be a little too light for reliable double action shooting. I happened to have a regular strength power rib Wolff spring handy and put it in, which cured the light double action strikes. I also installed a 13 lb rebound slide spring, which lightened up both single and double action pull without giving light strike issues. And my trigger did lighten up more with use, as well as smooth out some. I would shoot it a bit and see how breaks in before sending it to a gunsmith for an action job, but I would also try changing the rebound slide spring for a lighter one too, which is easy to do and not expensive at all.

BTW, that factory mainspring I pulled out of my 627 Pro, I also tried it in my 3 1/2" 27-2 and it also proved to be too light for reliable double action shooting in it too.
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Old 10-09-2017, 01:11 PM
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iPac iPac is offline
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I personally think a factory DA pull should be around 10#s. However, there are many S&Ws out there heavier than my 12# max Lyman can read, some approaching 15+#. I don't care for heavy pulls like that.

My 629-2E was pushing 15#s. I installed the middle weight rebound spring out of a three pack, 12# IIRC, then backed off the strain screw until it reliably rebounded. After testing primer reliability, permanently modify the strain screw. When all said and done, I had a DA pull of around 9.5# and a SA pull of 2.5#. This was with polishing internals too.

However, I firmly believe the reason for the overly strong springs is intentional due to safety. Since S&W's hammer cocking notches are only about .006", the notch itself and the trigger sear need to be about perfect to prevent push-off. The slightest buggering of either surface can induce this, but overly heavy springs can counter or hide push-off.

When lightening my 629, I ended up with push-off due to a slightly buggered trigger sear. I had to re-cut the sear then everything was kosher again. So lightening springs can open other worms, but if it was built properly and remains that way, you should have nothing to worry about.

Just an aside, I "prefer" my DA pulls around 7#, but not every gun is capable. Other than that, 8 or 9#s is about the sweet spot for me, the lower the better. Everyone is different, but the smoothness of the action is usually more important for most than what the exact weight numbers are. So what you prefer is personal and will need determined. This will also vary depending on purpose. A gun that I use for targeting or hunting will be shot in SA, so DA isn't that important to address.

Last edited by iPac; 10-09-2017 at 01:24 PM.
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Old 10-09-2017, 01:16 PM
gman51 gman51 is offline
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Default

When I got my 627 Pro I was sort of surprised by the heavy DA pull. I loosened the main spring screw a bit just to where I noticed a likable pull. Then I dripped some gun oil down into the trigger and hammer areas that contact metal.
This made big improvement in trigger pull to the point I am very satisfied with it now. People say don't mess with the main spring screw because it can cause light strikes but I have had no problems with it. Jerry Miculek shows adjusting the main spring in his trigger job video. If an expert shooter does it then I am okay with it. Granted you want to check that you don't back it off to much and get light strikes.

My 627 Pro now has probably the best trigger of all my revolvers.
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Old 10-09-2017, 02:30 PM
Bill In Texas Bill In Texas is offline
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Congrats on the new gun!
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Old 10-12-2017, 06:33 PM
sw dan sw dan is offline
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hi folks update on my 627 pro,
brought the gun to my gunsmith friend, we noticed that the counter sunk crown, was never cleaned up, and the crown still had burs on it. a look at the the extractor star face, burs on it. when he popped the side plate off, he could not believe all the burs, that were not polished or stoned off. also, a lot of over travel on the trigger. it took him over 3 hours of work, to get the gun working like it should have in the first place. he also a action job, and installed a spring kit. it is now a wonderful revolver. it should have been that way in the first place, other than the action work. i will have to say, s&w quality control, if there is any, is very poor.
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