Originally Posted by Slash2
What are your powder choices for a 20" barrel with a 1:12 twist shooting 150 grain SMK's and Barnes 150 gr, Tipped TSX'S?
I'm getting about 200 FPS below published data with IMR 4064 and Varget. BLC(2) has been recommended as a faster powder, better for shorter barrels, what are your choices for 20 inchers?
How close are you to the published max loads with the 4064 and/or Varget? If you still got room to spare, just bump it up...
Otherwise, here's a list of commerical powder ranked by burn rate
FWIW, Sierra suggests a MV of 2700 FPS for their (150 grain) accuracy load using N140, which as per the above chart ranks just below the 4064. BLC-2 ranks right around the same as 748, both of which (according to the chart) burn faster than Varget or 4064.
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