I bought a Tru-Glo Red Dot for shotguns for my turkey hunts but I have never had any luck at all getting it to sight in.. has anyone had this issue? I shoot at 15 yds and say it misses high left. So I do the necessary adjustment and shoot again. It misses way low left. then it will go way right the high left, ect.. Just no rhyme or reason to how it moves as to the adjustments I applied. IT WONT SIGHT IN! $85 down the drain. was it just too cheap for my 12 gauge?