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JHB,
I think you are asking a question with infinite possible answers. As TR mentioned, instead of a blanket on “SBR” powder burn rates, what is the exact length of barrel you plan on using and all your planned calibers? An answer for a typical 14.5/11/10.5/10.3 is very different than the answer for a 9/7.5 inch barrel or less. As well as all variations and curves on multi calibers. I would not want to mislead you to say something is okay, then find out you are making a 7.5 in something special. I do concur with the answers above though.
So, what is it you are planning on making?
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