Correlation between hammer spring and trigger pull

[txgunsuscg]

Just wondering if there is any sort of formula dealing with the ratio of the hammer spring strength to the trigger pull weight? For example, if I lower the strength in the mainspring of my BHP or 1911 by two pounds (or 4, or whatever weight Wolff happens to have in stock), what is the theoretical corresponding reduction in trigger pull weight? Is it mostly a try it and see proposition?

 

[rcmodel]

No meaningful correlation by changing the main spring.

On a 1911 the sear/hammer hook angle & depth, disconnector smoothness & fit, + the strength of the three lief sear spring does 95%+ of the pull weight changing.

I'm no Hi-Power expert, but I think you will find the sear/hammer engagement & angle, sear spring strength, trigger spring strength, & mag disconnect drag having much more effect then mainspring strength.

rc

 

[Owen]

it has a big effect on a DA, it will be proportional to the lever arms involved...finger to trigger pivot, trigger pivot to trigger bar, trigger bar to hammer pivot.

 

[The Lone Haranguer]

I think this makes a lot more difference on a DA trigger than a SA one.

 

[JDGray]

If you have a Springfield with the ILS MSH, it lightens the pull quite a bit by replacing the mainspring cap, and spring to Colt style. SA uses a 30# spring, colt a 21#, you can feel the difference.

 

[The Lone Haranguer]

It is very common, with DA triggers, to put "lighter" mainsprings in them to reduce the pull weight, but it is uncommon to do so with the 1911.

 

[Walt Sherrill]

As noted above, it makes more difference with DA trigger pull than SA. But, further, each gun design has slightly different interactions between the parts, and different degrees of "leverage" -- and if you're trying to lighten the trigger, you must simply get some lighter springs and experiment. Some will feel great but won't ignite primers, etc.