Thread: New acoustic chronograph

Just tested mine today for the first time. Shot over it with a 270Win pushing 140 VLD's, and a 7mmRM pushing 180 VLD's. Both loads I have used for a long time. The upshot is this thing is quite good. No velocity variation with light changes at all. Results when compared to 26 x 3 shot strings through the 7mmRM recorded in my range log book shot over a Prochrono came in at 10 fps under the average for all those strings. However the variation of those 26 x 3 shot stings measured with the Prochrono was 72 fps depending on the ambient light at the time of recording. My range book only lists the light as "sunny" or "dull" aganst each string (not very scientific I know).
I set up the Superchrono at a measured five yards from the muzzle as I normally do with the Prochrono. 18" under the line of sight, aimed at a mark 18" under the centre of my target. The target was 100 yards away. Everything I have read about the Superchrono emphasises the need to be parrallel to the bullet path. I also used Alkali AA's as suggested by the manufacturer.
I will carry out a more comprehensive comparison when I get time (in a month), but initial impressions are good.
It does however take a little longer to set up properly than my Prochrono, but the results are less shots for the same information.