There is a primer test which shows a power ranking on the www.castingstuff.com web site. It's near the bottom of the home page. Most of it is common sense, if there is such a thing, but there is some interesting results.
My loading experience is limited yet but I did find a load that primer maker made a big difference. I was loading for .308 with Varget. I found a load that was light( I was loading for a youngster) and with a 165 gr bullet and WLR primer. I got an accurate load and then put in the CCI200 primer. Groups tightened further.
This year I tested again with and with a full power load and got the same result. My 30.06 load could care less what primer you use.
What I have started doing is get an accurate load and then just try that load with another primer. It just could be different.
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