Originally Posted by MNbogboy
they could test different crush values with each primer to see if I could get any two of them to act exactly the same
This I know is too fine of an adjustment to match different primer brands.
But I do think striking adjustments 'might' do it.
I suspect the trial & error abstract of [which primer is working best for this chamber/load?] comes down to attributes in striking of primers.
In other words, IMO a particular primer doesn't work better in a gun because it's better than other primers. It's working better in THAT GUN because of THAT GUN'S striking.
I've had to learn(the hard way) that changing striking is just as significant as changing primer make, when a firing pin slipped in it's cocking piece. With this I had to do a bunch of testing to identify the best pin setting for that action/trigger/bolt/primer/load. What I found amidst this was that optimum settings for one primer brand ended up different than for another. And, I was rewarded with better shooting results than I ever would have reached, if not for this event.
Better still, I was rewarded with another new perspective in reloading.
Ever notice nobody tells us where to set our firing pins?
If one rainy day you decide to take down a bolt for total maintenance, be sure to carefully measure released pin protrusion from the boltface(or shroud), and match mark the pin as held, BEFORE disturbing it. Otherwise, you'll screw yourself till it hurts..