I've been using 26.0g BLC-2 under 55g FMJ's in my AR and it's pretty good. With the 69g MK's, not so good, or at least not any better than the 55's, having better luck with the MK's with hand weighed charges of IMR-4064.
When I run out of this batch of BLC-2, I'm going to try some RL-15 on a suggestion from a HP shooter.
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