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    Advanced Marksmanship Need Some Hepl With Marksmanship

    I am shooting an Anschutz 1413 using Redfield Olympic front and rear sights. I have an adjustable rear aperature that allows an opening from 0.8 mm to 2.2 mm. I am 62 years old. My problem is there is an apparent mirage in the center of the rear aperature--kinda looks like a piece of "lint"...