My Benji Trail NPSS shoots real fine with Crosman Premier UltraMags (14.3gr). Very consistent fit.
Get yourself a copy of ChairgunPro and run it for optimized zero distance.
Chairgun says my optimum distance is 32.5 yards with that pellet and a kill zone of one inch.
It should shoot within that 1-inch from 13.7 yd to 36.4 yd.
A mildot chart generated by Chairgun will show the holdover/holdunder for other ranges based on scope magnification.
You can download ChairgunPro from: http://www.hawkeoptics.com/us/chairgun/index.php
You may need to register for the download, but it's just to get you on their mailing list. No charge.
My normal back yard range is 20 yd.
TomJ - 65yrs
Current Air Arsenal:
Gamo Big Cat .177 with GRT-III trigger...
Benji Trail NPSS .22 with GRT-III trigger...
AirForce TalonSS .22