IIRC, the data published by Sierra was based on a 26" barrel (for .308). That should equate to a loss of just under 150 FPS out of a 20" barrel:
Using their load data, it looks like it would take an extra 2.4 grains of BLC-2 to make up that difference... which should put you right around 47.6 grains - almost a full grain under Sierra's published max load. How much BLC2 are you loading?
How far (from your rifle) is your chrono?
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