I have just finished load development on my 1-8 twist 20inch barrel with 75gr eld m. I tried two powders 2208 and BM2. BM2 23.5 max gave me 2800fps. 2208 24.5gr gave me 2700fps. I stuck with the 2208 because it gave the lowest es and 3 bullets touching at 100. But the BM2 grouped good well. Hope this is of some help
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