Someone else may correct me on this..
If I use H-110 or WW-296 I use either Winchester or magnum primers. I've gone to CCI's and they seem to be consistent. Also, there's a caution to stay within a range and not go too low either.
There are a number of older threads on this. Read the Sixgunner "Dissolving the Myth" and the thread history and you should be good to go.
Make sure you hang on when you light off the first one.
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