GP-100 trigger before and after Wolff springs

[mattmillerrx]

I thought I would post my results, since I had trouble finding anyone else's on the web.  I usually change the springs out in my revolvers shortly after buying...however, I was debating this one because the trigger was not as bad as most from the factory.  But, glad I did.


(measure with Lyman scale average of 5 pulls)
Factory SA: 4 pounds 8.4 ounces
Factory DA: 10 pounds 8 ounces


Results after changing out the trigger return spring for the 8lb spring/factory hammer spring
SA: 3 pounds 5 ounces
DA: 10 pounds even


Results with the same 8lb TR spring above and installing the 10 lb hammer spring


SA: 3 lbs 4.1 ounces
DA 9 lbs 5.5 ounces


The perceived pull is much better after installing these springs.  I will try at the range soon for reliability, I use CCI primers which are known as the hardest...so if it fires these without issue, it should be good with other primer brands. I have the other springs in the kit and the factory springs, so if any issue come up can always switch them out.


This will be the 5th or 6th revolver I have done this on and have yet to have an issue.


Happy shooting

[irold]

Interesting , Matt .  Thanks for the info.  I have been comtemplating changing the springs on that sp-101 when I get it. ( assuming it's typical of Ruger actions )  Did you change out the springs on your 101 ?
I , also , use CCI for all but my Large Pistols...( WLP ), Never had any issues.  I've had action work on several revolvers....don't know exactly what was done.  If I can change out some springs and get a decent trigger pull with our sacrifacing reliabilty....great
 
regards , irold

[mattmillerrx]

Yes, I just got mine back and replaced the springs in it first thing.  Double action is about 9.5 lbs and SA is about 3 lbs with the 10 lb hammer spring and 8lb return spring.  I have not shot it yet since getting it back so will have to test for reliability.


I did have one reload fail to go off on the GP100.  I think it was one I did not get the primer seated on fully (it had a nice hard dent in it and went off on the second try).  It did shoot some outstanding groups with the lighter trigger.  However, in rapid fire I did not feel like the 8 lb spring was enough.  Not sure how to describe it but felt I had to be conscious of letting the trigger go all the way forward.  I now have the 10 lb return spring and the 12 lb hammer spring in the gp-100 and have not shot it since to test.  If I remember right, I am at 9 lbs 10 oz with DA and 4 lbs with SA.


I am going to test the 101 as is and see what happens, if needed I may go to the 12 lb hammer and 10lb return just like the gp100.  Regardless of the end result on these it is an nice improvement with little investment.


The GP-100 and SP-101 use different springs but they change the same way and it is super easy.  I don't want to mis-lead you as I have done this on several guns and never had any reliability problems.  If it is a CCW gun or home defense gun, either keep the factory hammer spring and only change the return spring OR do a lot of shooting to make sure the lighter hammer spring will be reliable.  I apply the same rule they use for autos for reliability.  It is a little different depending on where you here it but it goes something like 250 rounds to 500 rounds before trusting it.  I tend to do about 250 rounds of cheap stuff/reloads in my autos and around 100 rounds of what I plan to carry (I usually carry something that I can afford to shoot some of once in a while).  I will do the same with both of these guns. 

[irold]

Sounds good ,  Thanks   
 
regards , irold

[tacklebury]

Nice to see numerical data put to it. 

[Tom C.]

Next time you take it apart, you might consider using some very fine crocus cloth and very lightly smooth the mating surfaces of the double action trigger, then use a little gun grease from Brownell’s. See how that feels.