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You've worded it somewhat better- I couldn't recall what they named the 747.

I used 748 for years in my .223, and true to the info about burn speed, the 747 needed backing off slightly in that...

W748 is fine in a .308 with med weight bullets but it's not temp-stable like 2208. It can produce high velocities- 3000 fps with 150s in a 30"bbl. Fullbore shooters tried it decades ago but it never...