Seems to be pulling to the left.
 

In my post about the new range traditions, I can't help but notice, and I wonder if anyone else did, that all of the shots at 100 yards with the Powerbelt bullets were pretty much dead on vertically. But all of the shots at the same distance with sabots, either with the Traditions, Shock Wave or the T/C Mag Express XTP's, Pulled to the left anywhere from 1 to 3 inches. Can anyone explain why?

Different weight, different bullet design.

vertical string = unnatual pressure on the stock. My brother in law did that with my Optima after i just shot a 1 1/4" 5 shot group. He put so much pressure by pulling the wrist down tight that his 3 shots were a 8" vertical string.

Different projectiles shoot differently. The Copper series Powerbelts shoot dead center when im sighted in and the Platinum powerbelts shoot 2" to the right.

pluckit

Each load - projectile creates 'Harmonics' in the barrel (vibrations). Different loads different projectles, create different vibrations changing the POI down range.

almost every time you shot a differt bullet and weigh of bullet your aim will change