Man.. I can't help EXACTLY, but if it's calibrated to 5.56mm, the bullet weight isn't THAT critical in my experience. We're running the COGs out to 600 and 750, and the M4A1 reticle tracks great with 69 gr and 77 gr. M855 is hotter, so I don't understand how the SS109 bullet doesn't outrun the BDC, but we don't shoot that stuff anyway.
Like sinister, here, posted (I think)... the reticle is an estimation tool, not the precise answer of a Nightforce dial up. And the trajectory of 55 and 62 is close enough to 500, that I wouldn't sweat it. My 2 cents.
"What would a $2,000 Geissele Super Duty do that a $500 PSA door buster on Black Friday couldn't do?" - Stopsign32v
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