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SRH firing pin question

This is a discussion on SRH firing pin question within the Ruger Double Action forums, part of the Pistol & Revolver Forum category; ok so in my quest for light and slick I have got it "ok" running lightest springs I can get my hands on, but want ...


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Old July 18th, 2013, 06:14 AM   #1
 
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SRH firing pin question

ok so in my quest for light and slick I have got it "ok" running lightest springs I can get my hands on, but want to try going lighter with some custom springs from local company

my current thing to look at is the spring on the firing pin, my firing pin is pretty tensioned,

I have had a look and Im guessing that the pin thats been ground backetc is the one that retains the firing pin?

I currently have no issues at all with primer ignition, 100% reliability with federal primers

my problem is that I picked up and tried my mates S&W and now trigger envy has gotten the best of me

I know that totally different designs and operation mean that Im unlikely to get mine as good, but whats the accepted limit of, its not getting any lighter??



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Old July 18th, 2013, 06:21 AM   #2
 
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need to double check later but using lyman trigger pull, I get average of 10 pulls

SA 3lb 1oz
DA 8lb 1oz ( this figure is gained early on and stays constant right through to hammer release)

its smooth, the reset, trigger going forward stage is not as nice as I would like it to be, but everything I can see and think of is polished and worked on

just wondering if Im trying to achieve something that just isnt possible? friends with Taurus and S&W are sub 6lb DA.

Im already doing some weights to be able to shoot this thing LOL 5lb 11oz as it is with a small red dot sight.

Last edited by UK Tony; July 18th, 2013 at 06:37 AM.
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Old July 18th, 2013, 03:09 PM   #3
 
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I don't see how the firing pin rebound spring is involved in your challenge to lower the trigger pull. I would stay out of there unless needed!

Unfortunately, I only have GPs and Security Sixs here to check now. (I have had several 45 SRH on backorder for far too long...) On a GP platform I expect about a 7.5 lb DA and 2.5 lb SA with a properly smoothed gun. I do carry guns though and I expect that your SRH is not being carried with a IWB holster!!

I would suspect that the S&W and Taurus guns you have tried fail on primers occasionally with that low DA pull but if not that is pretty slick. I'll still take a perfectly tuned Ruger every time.
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Old July 19th, 2013, 01:38 AM   #4
 
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thanks for reply

the firing pin requires considerable pressure to move it. I had wanted to try lightening that to see if I could then go lighter on main spring to reduce the hammer pressure needed to actually move the pin

just thinking out loud and trying to look at all avenues

and nope, not carrying it LOL, its target/practical comp use, although we do use holsters for competitions, with its new red dot I goes past 6lb in weight, not really a carry gun even if we were allowed LOL
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Old July 19th, 2013, 06:36 AM   #5
 
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Tony,
The S&W will either be a K-frame or L-frame based build (and five times the price of your Ruger ).

The smaller cylinder of those frame sizes has less weight, translating to a lower felt trigger pull, remember the D/A stroke has to push the mass of the cylinder around via the hand. The Taurus seven shot .357 and even the .44 has a lighter cylinder than the Ruger and that will make a difference.

I know what you are thinking with firing pin spring weight, but I don't think it is going to get you where you want to be. Don't forget that the firing pin spring needs to retract it sharpish on trigger rest otherwise it will bind up.

My advice work with your gun to get the hang of the trigger stroke. Overall weight of action stroke is far less critical than technique. Your quoted trigger weights are well within the boundaries of comfortably useable.
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Old July 19th, 2013, 06:39 AM   #6
 
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Quote:
Originally Posted by UK Tony View Post
Its smooth, the reset, trigger going forward stage is not as nice as I would like it to be, but everything I can see and think of is polished and worked on.
Did you polish the hole the return plunger runs in?
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Old July 19th, 2013, 07:39 AM   #7
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UK Tony, I wouldn't mess with the firing pin spring ... it just doesn't present enough tension to worry about and if it were lightened, it would affect the function of the revolver.

Here's something that will work: Take a look at the face of your hammer. Note the top step strikes the frame and the bottom step strikes the firing pin. Most of the hammer's energy is dissipated by the frame. By removing up to ,020" from the top step, more energy will be applied to the firing pin and less will be wasted on the frame. Here's a photo showing a temporary jig that keeps the top step at the correct angle when removing .020". Find a drill bit that fits the hole in the hammer. Drill a hole in the wood as noted in the photo then use the shank of the same drill bit as a pivot. Measure from the hammer spur to the face of the top step prior and note the measurement. Grind the top step face until you remove .020".

After doing the hammer mod, you can lighten the hammer spring even more to get DA trigger pull down to 6 lbs. SA gets very light ... under 2 lb so be careful.

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Old July 19th, 2013, 09:21 AM   #8
 
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Thanks mate, the S&W my mate has weighs more than my ruger! theres 400g in it!! but now I have added a red dot and once the stainless counterweight is fitted they will both be about the same 2590g

but yes your right, the cylinder is noticeably smaller and thus less rotating mass for the DA

it wasn't much more money that your Ruger either! lucky git

anyway

lowegan, your a star, I had heard of this mod but now that you have spoken of it I will go ahead with faith

the trigger is nice and works great, but as Im used to lightweight match triggers inrifles etc,I just want it lighter. the engineer in me just wants to play with it
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Old July 19th, 2013, 10:20 PM   #9
 
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Well your mate was extremely lucky, I was quoting what it costs to commission one new from either of the custom builders in Germany.

Unfortunately basing a comparison on match triggers in rifles is never going to be ideal, after all such match triggers merely need to hold a cocked hammer or striker, whereas a D/A dtroke does a lot more so it will never compare, but practice and technique goes a long way to compensating for that.
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