My experience with cheap scopes is that they do not hold zero well. Go to sight them in before hunting season and they will be off a bit and the turret marks do not conform to the movement of the reticles. You crank them and they don't move enough and then jump too much, then you chase them the other direction. Attended a seminar where the instructor had us fire a three shot group, move the adjustments up four inches, fire again, right four inches, shoot again, down four inches, shoot again, left four inches to starting point and fire again. If you got close to a four inch square, you had a good scope, if you didn't - scrap it and buy a better one. My Bushnell Trophy, which I would consider a lower mid-range priced scope, tested OK. Some of the other scopes- anything but.