Not turning the windage knobs back to zero after a string... can bite ya one of two ways. For me, its usually when I pull the gun back out after a pit change and look at the knobs and go 'Oh crap. How many revs off - and which way - am I?!?'. I've seen others who forgot to zero their windage and cranked up from 900 to 1000... and ran out of elevation as they were over far enough that they ran into the side of the tube. Now that will make your mental wheels come off!
Switching between scopes drives me batty... not so much on windage, but elevation. Several of my guns have NF BR 12-42x with 1/8 moa elevation, 6 moa per rev., just under 5 revs from 100 to 1000 with a B155.5BT @ 2950. *One* gun has a NF NXS 12-42x with 1/8 moa elev. clicks... and only 5 moa per rev. Nerfing the sighters into the berm in front of the target, and then 'fixing' your come-ups and proceeding with your record shots is *not* a skill I recommending developing...
Been bit by the position bug too... where I *know* my position is slipping, but I'm still putting them down the middle so I'm reluctant to stop and rebuild the position for fear of pooching a 9 out the other side. Of course, when eventually the position does go kaput, and its usually worse than a 9. Perfect case in point: team match @ 2009 FCNC, coach had the wind figgered out. We were smokin' along... sighters 9, X, then X, 10, X, felt things slipping a little... 10, X, X... *wide* 8, dang near a 7. Coach looks at me and ask if that was me or the wind. In a very small voice, I said 'it was me'. Fixed my position, kept the wind the same, and finished out the string with a 198-7X @ 1000yds, with one called bad shot. Talk about a heart-breaker...
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