With a 20 moa tac 21 chassis and the scope you have you should have no problem dialing out to 1000 yrds Just go out and do it and if you run out of adjustment on the scope you can then go get some Burris rings and and some more MOA. I was out last weekend with my 6.5 creedmore and with a 0 moa rail that came on it and bushnell 6500 I could not dial out to 800 yrds had to hold over so I will put a 20 moa rail on it and we will hit the 1000 yrds.
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