Your velocities are real! Most people aren't using N570I need to get some new brass and revisit my Sherman. Been to long since I shot it. My velocities seem much higher than what you guys are posting. 64 gr of N570 got me 3339 fps with a 140 Berger out of a 28” Hart. My friends Sherman is the same as mine but his wears a 28” Brux. Maybe the chronograph is out. Drops lined up out to 700 yds though.