photoracer
I'm not real sure what you are refering to. I took the firing spring out of the bolt and was surprised how much tension there was holding the firing pin rearward. I can't control how much forward thrust the triger has when striking the firing pin with brand of triger I have, but I can control how much resistance the hammer has to overcome to strike the rim of the case.
The springs I orderd and trimed was mic with digital calipers, for coil diameter, inside and out, plus coil wire thickness to achieve the same tension as a factory spring. Reducing the amount of coils, changes the amount of force needed to strike the cases harder.