I used QuickLOAD's defaults to find a barrel time for 100% case fill of IMR4831. I then told it to pick out other powders producing the same barrel time and looked at the ones that do it at about the same pressure but with a smaller percent case fill. The three available candidates that did this without losing velocity are Vihtavuori N550 and Ramshot Hunter and Norma URP. Any one of them would let you load a little warmer than you are now without compressing the charge, which should tune you into a sweet spot.
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Last edited by Unclenick; November 29, 2012 at 01:18 PM.
Reason: typo fix