617-2 Wolf power rib type 1 misfire problems

[S&W1006]

Hey guys. I have been shooting my 617 in some speed competitions and I decided to lighten the trigger pull. I contacted Wolf and they recomended I use the type 1 hammer spring for reliability. I ordered the kit and settled on the 15 lb trigger return spring (the 13 was sticking) the type 1 hammer spring is supposed to keep the factory weight but be smoother. It is smoother but I am getting lots of misfires now no matter what ammo I use. I am getting 4-5 misfires per hundred before it was zero. Has anybody else experienced this? I am contacting Wolf to see what they say. I like how the spring feels but I can't live with the misfires. I was going to install a Apex tactical firing pin but I contacted them and they do not recommend it for rimfires. Any suggestions?

[ken158]

Be sure the mainspring screw is tight and you may need to change ammo if light indent misfire persists.

[S&W1006]

The mainspring screw is tight and I even tried match ammo with the same result. I put the factory spring back in for now but I would like to be able to use the Wolf spring it has a better feel.

[jaymoore]

I just give the factory mainspring a workover anymore. Too many Wolff springs have been less than satisfactory. At leat try polishing the hooks and the gap in between. Don't go crazy. Just remove the roughness. I actually will do the entire spring to a high polish, but it takes a long time using hand stones. But no potential for getting localized heating that way. After that, it depends on how "practical" the revolver is intended to be.

[Pisgah]

Rimfire revolvers need stout springs. It is the nature of the rimfire cartridge -- denting that rim and igniting the primer takes more evergy than setting off a centerfire primer, and there's no way around it.

[old&slow]

I've used several Wolff spring kits in my center fire S&W revolvers
and have usually had good luck with them.

However, my M617 did not like them and I would get several miss fires. I had to go back to the factory main spring to keep it working right.

[dentkimterry]

Check out and follow the procedure for re-springing your 617
laid out by the contributor STAINZ. I did it to both of my 617's
and they work great. It involves a little testing but once done
my guns have operated flawlessly. It is in this thread:
S&W 617-6 and Wolff Spring Kits

[S&W1006]

Originally Posted by dentkimterry

Check out and follow the procedure for re-springing your 617
laid out by the contributor STAINZ. I did it to both of my 617's
and they work great. It involves a little testing but once done
my guns have operated flawlessly. It is in this thread:
S&W 617-6 and Wolff Spring Kits

Thanks I'll give that a try. That makes sense the strain screw does go right into the power rib. Also I just realized I've been misspelling Wolff oops. I will try that because the trigger does feel better and doesn't stack like the stock spring.

[S&W1006]

I picked up some 8-32 set screws from the local bolt dealer. I installed it and headed to the range. I adjusted it 1/2 turn at a time and after 1 full turn the misfire problem went away. I ran 150 rounds through it with no failures. Now problem solved and the trigger feels better than stock. Also I did swap out the trigger return spring for the 14 lb spring and it ran flawless. Thanks for the help guys.