primer hardness

[Col. Harrumph]

Here's what I "know" about primer brands: CCI's are the hardest to ignite, and Federals the easiest, depending on what the cup is made of. Where, in your experience, would you put the others?

CCI (hardest)
.
.
.
Winchester
.
Federal (softest)

 

[redcon1]

This was posted on one of the recent primer/pressure question threads. It's still up on my browser tabs and seems somewhat pertinent to your question.
PRIMERS AND PRESSURE
by James Calhoon(First Printed in Varmint Hunter Magazine, October, 1995)

 

[fxvr5]

Might be something useful here:

https://www.shootingtimes.com/editorial/spring-rates-and-trigger-pull-weights/383919

Scroll down to the PRIMER SENSITIVITY section.

 

[Palladan44]

Lot to lot differences may move any one of the brands up or down the scale at any time.
The metallic composition and cup thickness are called on to meet certain standards. But LOT to LOT differences (especially the numbers they're pumping out today) can be quantified in some way shape or form if you studied hard enough.