You have to shoot at least 10 shots to get a clear idea of the average speed of a given load, and the more you shoot, the more accurate your idea will be. That's prohibitive for load development.
I've used the older-type versions from PACT and a couple of MagnetoSpeeds. The PACT-style units take while to set up and don't always work well on cloudy days. The MagnetoSpeed attaches to the barrel, which throws your POI, so you can't test for accuracy and speed at the same time.
I'm getting a Garmin so I can test for accuracy and velocity at the same time. I'm really interested to see what 100- and 200-shot averages look like with a couple of loads.
Okie John
