Large rifle primer vs small rifle primers - 6mm

I have brass in both, and I have always ran SRP Magnums because I could find them easily as compared to LRP and never had a problem with them going bang until recently when I tried Staball powder and started getting some delayed fires. I switched to the LRP brass with the same powder and did not get any delayed fires, so I am staying with the LRPs until they become impossible to get.
How noticeable is the delayed fire? I've never actually seen it happen.
 
Why? What’s so difficult about it?

People were wildcating SRP 308 Palma brass to get SRP pockets so might as well give the people what they want.
I can think of 5 calibers that I reload that have both. I buy large, random lots of brass, mostly for plinking/practice, so I have to sort every damned case for small/large and prime them separately. It's a &^%$#@ PITA as far as I'm concerned and adds another layer/time to the reloading process.
 
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