Whoah Harsh! You're both raising legit issues I reckon. Scopes can wear out / shift / break etc and If you've never tested your glass (even if its just optically) then it may not occur to you to check it. To me, you cant beat measuring fall of shot on a good day, recording everything you can think of. Then, just fudge the elev adj in your software till they marry up 'cause its far easier than playing with bc and mv. That's an endless exercise of 'robbing peter to pay paul'.
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