My load development works like this on a gun that has been bedded with the barrel freefloated, trigger tuned:
a. establish the distance to the lands, OAL
b. decide if you want to touch the lands, .005 off the lands, or .010 off the lands, then work up the best powder charge.
c. after you have the best powder charge, then play with seating depth to fine tune what the rifle likes, be open minded, the longer you do this, the more you will be humbled in your findings as there is no "etched in stone" way to do things.
d. Now when you have established the powder charge and seating depth, change primers with no other changes. Often you see groups cut in half while other times the groups are completely blown. Again, an open mind will continue to humble you as your most favorite primer or the primer you like or have the most of ends up being NOT the best for accuracy.
It has been said that you can tune an accuracy load for a particular primer, and I could not argue with this statement.
You just have to figure out a way that is best for you because there are so many variables this can drive you crazy.
The BIG issue here is seating depth...jeez...there is no grey area in that this is where major gains in accuracy are achieved. Use a Hornady or Davidson Ogive gauge, measuring off the tip of the bullet gives hit and miss results, especially between different lots of the same maker's bullets. The Hornady Ogive gauge works best with a case that has been fire formed in your chamber...very consistent results.
I got off subject from primer selection, but I have watched people struggle for years with load development.
In today's world of shortage of components, we struggle to have a variety of primers to choose from, and there is no end in sight to the shortage.