I see this alot on the range,a fellow will buy a new gun,the dealer will bore sight it and he comes to the range and starts out at 100 yds,can' t even find his bullet holes they are so far off.Saw one fellow that bought a 22 mag ,had it bore sighted and started out at 200 yds was just cussing because he couldn' t tell where he was hitting,I susgested he move to 25 yds to start with,we couldn' t even find where he was hitting at 25yds.I took the bolt out and bore sighted it on a dot @25 let him shoot using my rest,it was close enough then so that he could hold on the dot and I moved his cross hairs to the bullet hole he just shot.Didn' t take him long then to get it zerroed @100.
I have even heard remarks after missing a deer," they just bored sighted it yesterday."
A buddy has a hunt club down east said he had a new member to shoot and miss a big buck 3 times in a cutoff.He asked him if he had shot his new rifle before the hunt,told him they sighted in the rifle when he bought it.