http://www.frfrogspad.com/burnrate.htm
http://www.lapua.com/upload/reloading/reloadingburningratechart2011.pdf
http://www.reloadersnest.com/burnrates.asp

Find comparable powders here. Use their average and work from there.

Looks like H335 and BL(C)-2 or Win748 are on either side of it. Try these numbers and make an average. Work to the top and report back with your results!
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“It isn't so much that liberals are ignorant. It's just that they know so many things that aren't so.”
- Ronald Reagan