J frame .22 Wolff spring selection. - Pistolsmith

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Old 10-07-2019, 02:17 PM   #1
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J frame .22 Wolff spring selection.

I have a new 43c and I will be replacing both hammer & rebound springs. Though I’ve done this many times, I have forgotten which rebound is the correct match to the reduced hammer spring. Not too light or hammer will not reset.
I’ve use a 9# to replace 12# factory main spring. Fires reliably.
18# factory rebound is replaced by a 13# OR a 11#.
Which do you recommend??

I have never had a misfire with a 9# in S&W 317. May try an 8.5# or 8.0#.
ANY failures and it easy to change back up.

Many Thanks!
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Old 10-08-2019, 11:44 AM   #2
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Posts: 1,801
I'd go with the heavier spring.
In fact, I stopped using lighter rebound springs.

With a lighter rebound spring, you do get a lighter trigger pull, but it also slows the action down and you can't shoot as fast.
It ups the risk of a "short stroke" of the trigger or even failure to reset at all in a fouled gun.
Some top speed shooters even install rebound springs that are heavier then the factory spring to speed up action reset.
Shooters like Jerry Miculek can pull the trigger so fast, they can out run trigger reset.

What I usually did was what S&W themselves recommended to police armorers years ago, and that was to trim 1 to 1 1/2 coils off the rebound.
These days you can buy new, lighter springs, but I still went with shortening the factory spring.

A better option is to practice with the gun and build up your trigger finger and SMOOTH a few key parts.
A smooth action feels lighter.
You have to be careful what you smooth and you need to be aware that S&W parts old and the new MIM are surface hardened with a very thin, almost glass hard surface.
Do much of any major stoning and you can break through the thin surface, expose soft inner steel, and ruin the part.

Another aid to a smoother, lighter trigger is to use a good grease on key parts like the double action strut on the hammer, the bottom and inner side of the rebound, and the cocking interfaces of the hammer and trigger.

The Jerry Kuhnhausen Shop Manual on the S&W revolvers gives good instructions on what to do to get a smoother action.
Buy the manual from Brownell's or Midway.
Old 10-11-2019, 08:24 AM   #3
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Many Thanks!
Very good thoughts on the ‘compromise’ of reliability & light trigger weight.
I really do notice the improvement after a smoothing job & good lube.
Jerry’s book is invaluable. Especially the ‘Don’t mess with......’ advice.
Old 10-31-2019, 08:53 PM   #4
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Range results: 8# hammer & 11# rebounds worked perfect. Did notice the firing pin on the 43c is not a round pin but a vertical rectangle. Concentrates force on a smaller section of rim. The action is much smoother and somewhat lighter. If I get any miss-fires going up to the 9# should fix it with minimal increase in trigger pull.
No problems with trigger reset ether.
Sweet little gun!!

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