More research completed on the SuperChrono. This link provides a manufacturer's calculator that indicates the accuracy of recorded velocity with the SuperChrono increases substantially with reduced bullet velocity, given equivalent error in system setup. This means velocities recorded at 1000 yds would be more accurate than velocity recorded at 10 yds, given the same exact system setup. The calculator is available at this link:
SuperChrono at 1000 meters
Here are two calculations from the manufacturer provided calculator. I entered a 59 inch aiming error at a distance of 1000 meters for both calculations. This is a 5 foot aiming error. I think I can maintain unit setup error in this range or less at 1000 meters.
This first one is with a bullet velocity of 2953fps, similar to muzzle velocity, showing an aiming error (due to the unit being set up less than perfectly parallel with bullet path) causing the recorded velocity to deviate from true bullet velocity by 11fps
. Precision = 99.6%
This second calculation is with a bullet velocity of 1624 fps, similar to shooting my rifles at 1000 yds, showing the same aiming error causing a recorded velocity deviation of only 3fps
from true bullet velocity, for a precision of 99.8%
So the error in recorded velocity is reduced at lower bullet velocity. It is stated that this is due to the angle of the sonic wave (Mach wave) changing at lower velocity, compared to higher velocity. Bottom line
, any operator errors which result in the unit not being perfectly aligned with the bullet path will have a reduced affect on recorded velocity error when recording downrange velocity (lower bullet velocity) compared to recording velocity just off the muzzle (higher bullet velocity). This is a plus for me, since my only use of the SuperChrono will be recording downrange bullet velocity.