There is a warning on the 6 1/2's stating not to use in high intensity cartridges such as 17 Rem, 222, Rem, 223 Rem. I remember reading somewhere, but can't find it now, that the 6 1/2's should only be used on the 218 Bee (if I remember correct).
I do know that when I started loading for my 20 Extreme I had problems with the primers showing pressure signs at beginning loads. Switched to 7 1/2's and was able to load hotter loads. I don't run max pressure loads but couldn't get to the accurate ones with the 6 1/2's. So now I have about 1800 6 1/2 primers sitting in the back corner - any one interested?
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