Thread: Primer testing methods

How are people testing primers? I've seen several methods:

1. Shoot a 10 round ladder test over a chrono and look at the stability of the curve.

2. Load 3 rounds of your preferred charge with a different primer: -0.5gr, +0.0gr, and +0.5gr. Shoot them over a chrono and see if ES/SD improve.

3. Shoot groups with each primer and compare the sizes.

And finally some more questions:
What is your preferred method?
Will a specific powder have a preferred primer?
Is a good primer a good primer and will work well regardless of other variables?
Can a primer with poor stats group better than one with superior stats?