Originally Posted by Mikecr
The firing pin is held back and released by the trigger.
Therefore, the trigger directly affects firing pin impact. It affects the amount of pin fall on release, as well as friction in this fall(as is solved by the Kelby replacement for Jewells with certain actions), and yes lock time for sure. Bolt TURN/POSITION is also affected, and you should mind the consistent stopping of bolt turn. Don't assume it.
If, with a given trigger(not model but actual), you have not set the pin strike for best grouping, you probably have not reached the best from your gun. I have whitnessed a perfectly firing mis-setting of a firing pin cause ugly performance. Flyers..
This is an area rarely looked at or discussed. I believe there is a lot to learn here.
Ever wonder why we're left to swap primers trial & error during load development? Why a primer that sucked for you works great for someone else in the same cartridge & load?
The answer is primer striking. Well actually, the ABSTRACT is primer striking..
Some interesting comments and observations.
Though I have no idea why I have rifles that jumped while dryfiring (with a factory trigger) that are stone still after the installation of a Jewel.
I believe consistent ignition is paramount so I have my gunsmith spend a lot of time honing the pin bore and making perfect all contacting surfaces of the pin and bore.
Though I can't prove a loss of accuracy, the buggered up look of the J-lock pin and spring setup wreaks of bad workmanship and poor precision. I replace it with a quality spring and assembly, then have the pin bore blueprinted.