686 light primer striker under rapid fire.

Gros21 · May 14, 2016

Well my 686 used to suffer from light primer strikes so I installed a Wilson combat main Spring it stiffened up the trigger alot (had a very light action for hand loads) I'm still going through my 1000 factory geco loads (cheap **** loads but good rws brass) now during the rapid fire events I had 1 light strike per 6 rounds. This is 6 rounds 5 seconds.

I do have a set of Wilson combat rebound springs if it helps

After this I fired 150 rounds in a practise session no issues.

Also I have 1 round that refused to strike when struck a 2nd time is there any tricks I can use to get it to fire eg fill primer dent with xxxx as I don't have a puller

OKFC05 · May 14, 2016

Well, I use only Federal Primers in my IDPA Model 66 to avoid this very issue. When loaded with

(cheap **** loads but good rws brass)

the primers may not match your setup.

My walking around 686 is close to stock, with about 10# trigger, and fires most any commercial load reliably.

Primers that have been hit without firing do not always fire on the next hit. That phenomenon of firing on the second hit seems to be more associated with high primers that the first hit seats.

Gros21 · May 14, 2016

I'm I should say this is a 686-4 hammer mounted firing pin. I just got it and before I start reloading I need to go though my factory's so that way I have 1000 matching brass cases.

The trigger pull was VERY light when I got it it only ignited 1/2 the loads at any speed. So I installed a new main Spring it made the pull a lot heavyier but now only have issue on quick firing.

That's why i think it may be a rebound Spring issue. This gun is a target gun only

as its all our laws allow for (I'm an Aussie)

Once I go through my factory's I will be reloading with soft primer hand loads and will reinsert the softer mainspring as I was told when I got it its hit and miss with factory's but great with hand loads. I shot it in the same match with hand loads before I got it and the orginal owner did the same without issues.

The single action is still VERY VERY crisp and way better than a new pc 686.

Pizza Bob · May 15, 2016

Is there actually a light dent in the primer? If no dent or an off-center dent, then carry-up is your problem. When shooting rapid D/A the cylinder stop skips the stop notch and the cylinder over rotates slightly. You can try a stronger spring on the cylinder stop and/or clean-up the stop notches on the cylinder. A heavier rebound spring will only help if you are short-stroking the trigger and overrunning it.

Good luck.

Adios,

Pizza Bob

jh9 · May 15, 2016

European spec primers (geco) are hard. The Wilson mainspring is still reduced power. If it had an even lighter (type 2 wolff I assume) mainspring in it when you bought it used, it may also have an altered strain screw.

If you want to ensure hard primers go, you need an OEM spring, OEM strain screw and to make sure the screw is bottomed out. This will increase the DA weight significantly but it will work reliably with everything.

940-050-470WB

[url="http://www.brownells.com/handgun-parts/frame-parts/frame-hardware/frame-screws/strain-screw-round-butt-ss-prod15294.aspx]940-072-280WB[/url]

You may also want to get the next size up strain screw. If the shorter one doesn't provide enough preload, this one will:

[url="http://www.midwayusa.com/product/515288/smith-and-wesson-strain-screw-s-and-w-64-65-66-242-296-386-396-500-610-619-620-648-round-butt]midway 515288[/url]

If you're handloading and using only federal primers then you can go back to the lighter mainspring and possibly altered strain screw.

The rebound spring has no effect at all on light strikes.

Gros21 · May 15, 2016

Primers are hitting center but soft.

It's pretty darn heavy now. I'll order a few new parts I think.

Just seems weird it's only when rapid d/a firing. 150 single action shots perfectly fine.

My factory's won't last long with a few more practise sessions I'll order some primers/projectiles and the Dillon kit ASAP.

OKFC05 · May 15, 2016

Just seems weird it's only when rapid d/a firing. 150 single action shots perfectly fine

Page 50 in the Jerry Kuhnhausen S&W Revolver Shop Manual has illustrations and an explanation of the single action sear notch and the double action sear (little lever on the hammer).

686 light primer striker under rapid fire.

Gros21

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