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In my rifles I find that the first shot out of cold clean barrel is usually a couple of inches off. I normally shoot a couple of shots to get the barrel fowled let it cool and go from there. I site mine cold. Just another point I find that the zero shifts if I site in on a very hot day say 85 or higher. During my final site in before hunting season I try to do it on a mild day. Normally if its 50-60 out its good to 0.
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