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...But it's worth a call to Trijicon. They have good CS.
With so many bullet weights/loads and barrel lengths, I consider the "caliber" designation on the ACOG BDC worthless until you match it up with your exact load/barrel length. But I don't shoot 800 yards with my ACOGs.
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This ^. (As well as the illuminating screenshot posted above from Strelok). An ACOG is ultimately a battle optic; the stadia are "guides" but optimized to something specifically when designed. I pleasantly discovered while searching for which reticle I ultimately want that Trijicon Tech Spt iis quite responsive, even via email, to specific questions such as "what are the gradations in MOA for (insert reticle specifics here)?"
Doing that would likely remove a bit of buyer's remorse seen ranted about on the net. It's what they
do; they breathe this stuff. If one has a specific load worked up, or is wedded to a particular factory load, run the data, get your drops & engage Trijicon to see what they suggest. Someone who buys an RCO because "wow, dot-MIL!" and then shoots slo-mo krap ammo & can't hit their steel at 500 is an example that comes to mind. It can be avoided.