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SP101 Main spring question (9 lb)

This is a discussion on SP101 Main spring question (9 lb) within the Ruger Double Action forums, part of the Pistol & Revolver Forum category; I replaced the stock 14 lb main/hammer spring in my snub SP101 (.357) with a 9 lb. Wolff spring. I love the way it feels ...


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Old January 7th, 2017, 07:02 PM   #1
 
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SP101 Main spring question (9 lb)

I replaced the stock 14 lb main/hammer spring in my snub SP101 (.357) with a 9 lb. Wolff spring. I love the way it feels now. I know I have to take it to the range to confirm reliability, but I was wondering if anybody here with this same or similar setup has had any light primer strikes? Thanks.



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Old January 7th, 2017, 08:05 PM   #2
 
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I was worried about light strikes when I changed mine out but figured if I had a problem at the range, I could switch back. I've had no light strikes and no regrets
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Old January 7th, 2017, 08:35 PM   #3
 
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I put a 10# hammer spring combined with an 8# trigger spring on my SP101 and am very happy with it. The pull is now glass smooth. Have put a couple hundred rounds thru it since then and have had no light strikes or misfires.
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Old January 7th, 2017, 08:53 PM   #4
 
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I have the 9 lb mainspring and 8 lb trigger return spring in mine and have not had any FTFs. The gun has been tuned, though and I have played a little with firing pin protrusion. As an aside with this setup the double action is 8.4 lbs on a Chatillon recording gauge and is 9 lbs if I have the 10 lb mainspring in.
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Old January 8th, 2017, 06:37 AM   #5
 
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You guys that have the 8lb trigger spring, how is your trigger reset? mine was terrible with the 8lb spring so i had to go back to stock
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Old January 8th, 2017, 06:57 AM   #6
 
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Originally Posted by tstring View Post
You guys that have the 8lb trigger spring, how is your trigger reset? mine was terrible with the 8lb spring so i had to go back to stock
It depends on the particular revolver. I have two GP100's, and I put the 8lb trigger return springs in both of them. One revolver ran just fine and the other one would not. The one that wouldn't is a newer revolver and I think that with more break in it might cycle ok. I wouldn't want to use them in a revolver that would be used for personal defense.
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Old January 8th, 2017, 07:01 AM   #7
 
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Every time I play with the springs in a SP101 or GP-100 I swear to myself that I'm going to write down the final configuration and yet I never seem to manage that.

From memory, the 10# spring seems to be about as low as I can go and still have 100% reliable ignition. Because that's from memory it very well could be incorrect.

As for the trigger return spring, I think 8# may be a bit too low but again, relying on memory here.
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Old January 8th, 2017, 07:08 AM   #8
 
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Quote:
Originally Posted by wproct View Post
It depends on the particular revolver. I have two GP100's, and I put the 8lb trigger return springs in both of them. One revolver ran just fine and the other one would not. The one that wouldn't is a newer revolver and I think that with more break in it might cycle ok. I wouldn't want to use them in a revolver that would be used for personal defense.
Thanks. That's what I was guessing, just didn't know if anyone had any tricks to get the lighter spring going.
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Old January 8th, 2017, 07:09 AM   #9
 
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Quote:
Originally Posted by Argee1950 View Post
I put a 10# hammer spring combined with an 8# trigger spring on my SP101 and am very happy with it. The pull is now glass smooth. Have put a couple hundred rounds thru it since then and have had no light strikes or misfires.
I did this same process to three of my SP101's and have had no problems. I have an older SP101 in .22. I did not change anything on it for fear of light strikes on the rimfire primer.
I found the #9 pound spring to light when I tried it. I had no misfires but the #9 spring just felt to light for my liking.
Keep in mind that some .357 primers are harder than others and require more pressure to ignite. just my .02. Be Safe Shoot often.
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Old January 9th, 2017, 05:30 PM   #10
 
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Originally Posted by 78CJ5 View Post
I did this same process to three of my SP101's and have had no problems. I have an older SP101 in .22. I did not change anything on it for fear of light strikes on the rimfire primer.
I found the #9 pound spring to light when I tried it. I had no misfires but the #9 spring just felt to light for my liking.
Keep in mind that some .357 primers are harder than others and require more pressure to ignite. just my .02. Be Safe Shoot often.
I'm using a 10# hammer spring...I tried the 9# and didn't like the feel. I use the 8# trigger spring for a smooth release of the hammer. This combination just feels right to me..others mileage may vary.
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Old January 9th, 2017, 06:59 PM   #11
 
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I don't have access to the springs to check right now but I bought the Wolf spring set and installed the lightest springs
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Old January 11th, 2017, 07:22 AM   #12
 
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Quote:
Originally Posted by frym View Post
I know I have to take it to the range to confirm reliability, but I was wondering if anybody here with this same or similar setup has had any light primer strikes?
I dropped my springs down, but I took the time to polish all the surfaces to eliminate any binding or drag. We have four SP's in residence, all with Wolfe kits on board. Even the .22LR's are pretty much 100%, (not counting cheap bulk ammo).
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Old January 11th, 2017, 12:47 PM   #13
 
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I dropped my springs down, but I took the time to polish all the surfaces to eliminate any binding or drag. We have four SP's in residence, all with Wolfe kits on board. Even the .22LR's are pretty much 100%, (not counting cheap bulk ammo).
I didn't realize that they offered the spring kit for the .22.
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Old January 11th, 2017, 12:56 PM   #14
 
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I didn't realize that they offered the spring kit for the .22.
My bad...they do offer them for the SP101...they're not available for my LCR .22WMR...YET!
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Old January 12th, 2017, 06:36 PM   #15
 
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EACH individual SP101 is an entity to itself when it comes to lighter springs.......and like was said above I'm horrible with remembering what springs are in what gun. As soon as I get it reliable, and it pops 100 rounds of Winchester White Box (my "primer proof loads") I call it good and often forget the exact weights.

I left my .38 SP101 alone, it was OK with stock springs.

My new .22 SP101 hates light springs, I tried every weight mainspring from Wolff, I tried ISMI, I had my smith bob the hammer, and it won't pop every brand of .22 reliably with anything other than stock springs. ISMI felt the best, too, it was 100% with the high priced match stuff like Federal match, Eley, etc.........now that I have a .22 Single Six that pops everything, as my "range banger" .22, I may revisit the ISMI springs and just use "good" stuff in the SP......hmmmmmmm, wheels are turning.......
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