Quote:
Originally Posted by gripe
How accurate must the 100 yard zero be to make hits out to 1000 yards?
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You asked a very good fundamental question. I think many responders just got carried away thinking of complicated ballistic calculations.
The simple answer is that, using any centerfire cartridge which will retain decent trajectory at 1000 yards, a basic 100 yd zero, even close to the tolerances you asked about, will get you "on paper" at 1000 yds. If you consistently can shoot 1 MOA groups at 100, you should realistically be achieving first time hits within 3 MOA at 1000 depending on your ballistic program and the accuracy of the info entered.