Thanks for reporting the test, Charlie--partly because it fits into my experience that primer differences tend to matter most in either very small or very large cartridges, and especially not with extruded powders. Just one question: Did you weigh the two brands of brass?
Don't know if there's a more "medium" cartridge than the .308 with 165-168 grain bullets.
John
In the case of the large cartridges, was that with faster burning powders? If so, would that suggest faster burning powders are more sensitive to primer types and brands?
