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What do all the numbers mean?(IMR 4064)
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The number can be considered to just be part of the name.
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How can you tell how fast it burns compared to others?
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See posts above for powder burn rate charts. Just don't take them as absolutes.
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My Speer manual lists 8 powders for .223, How do you pick one?
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The powder that gives the highetst velocity at the lowest pressure with the highest loading density will usually be near the top of the 'best' list. Since that info isn't readily apparent, try Ramshot TAC or Hogdon Varget.
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Are they made with specific applications in mind, I.E. hunting, target, etc.
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Bullets are specific to the application, but powders typically just launch the bullets. With experimentation you find the bullet/powder/primer/case combination that your rifle likes. I am willing to sacrifice velocity for accuracy when working up a load.
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Is there a comprehensive list somewhere that answers all of these?
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Not that I'm aware of, but there's much info to be gleaned from searching and reading forums like this one.