Expanding boattail could reduce that to 2 in the brain housing group - only because there's not much left to aim at with the last 3 rounds. With milspec ball - 3 to the dome should get it done too, and every 3rd or 4th BG is a freebie on your ammo supply - bonus BG's as it were. 
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In the business of war, there is no invariable stategic advantage (shih) which can be relied upon at all times.
Sun-Tzu, "The Art of Warfare"
Hearing, I forget. Seeing, I remember. Writing (doing), I understand. Chinese Proverb
Too many people are looking for a magic bullet. As always, shot placement is the key. ~TR
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