Thread: Chronograph advice

Originally Posted by Cigar

I have an early Prochrono (before the digital model) and a Magnetospeed. The Prochrono sometimes gives some weird readings, mainly on sunny days when the light is coming from an angle, but when I used both together, two of the shots were within 1fps, if I recall correctly the third shot had a 30fps difference.
For your use, I would try to borrow one, or team up with a forum member who has one.

Further to my 3 shot test using both the Prochrono and Magnetospeed together, I have found some other data, averages of 3 or more shots from the same batches of reloads, but not the same shots, and sometimes not even on the same day.
Magnetospeed Prochrono Difference
2368 2375 +7
2987 2980 -7
3107 3094 -13
3138 3122 -16
3168 3151 -17
3187 3176 -11