If you sight in at 50 yds you will be close at 200, I would sight in at 50 then move to 200 and adjust to be dead on at 200. Then go back to 50 and check but do not re-adjust, that way you will be dead on at 200 and close enough at 50 that it will do the job. If you check at 100 you will know the hold under to hit at 100yds, you will probably need to hold 1.2" low at 100 to connect.
The 6.8 is the fastest growing cartridge and #1 choice for hunting deer and hogs with an AR15.
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