Flintlock, I find that H335 and W748 give me the best performance and accuracy in 223/5.56. Generally, I use 55 grain bullets in my varmint rifle (CZ527) and 62-64 grain bullets in my ARs. I have used both magnum and non-magnum primers with H335. I see a little more velocity with the mag primers, but not much. Other than that, I don't see a difference.
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