Excellent riflescope - Vortex Viper PST 6-24x50 FFP Rifle Scope

Purchased this scope along with a Sightmark offset mount. Bore sighted only. Mounted on an Armalite AR10 with a Shilen 24" bull barrel. Was not worried about the scope quality as per the reviews and have friends that have this model. Bore sighting got me on the paper at 200 yards and zeroed in using 168 grain Sierra BTHP w/Varget powder. Probably the best riflescope for the money. Plan to shoot out to 1000 yards. Just gotta find someplace nearby. Some reviews suggest blurriness at maximum magnification. Don't see it. Maybe the eye focus or parallax is not being adjusted.