gun, and move your head back and forth looking thru the scope, and see if the crosshairs stay on target or move around. Tasco usually has issues with parrallax.
When sighting it in I was hitting dead on at 100 yards. Got it a lot closer a lot faster than I did with the Leupold. I sighted it in a 9x power as thats usually what I use but when I shot at a lower power it seemed to be a similar shot. Maybe not exactly I couldn't tell but pretty close. Close enough for a deer.