It's all about matching the reticle to the aiming point. I remember watching Steve Blenkarne shoot a 10mm at 100m group with a aperture sighted .308 target rifle using about a 6" bullseye as an aiming point. One of my scopes has a central dot of about 30mm/100m, and I just draw a diamond slightly larger than that and the white showing around the dot very quickly shows if the sight picture is off.
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