Garmin chrono acting weird

[TradLife406]

Shot a bunch today with my Garmin. No issues. Until I pulled out grandpas old Browning b78 22-250.

Changed my bullet weight on the chrono to 50gr and went to shoot some test loads.
Shooting 10 shot feeler groups. I had an extreme spread of over 300 fps.
There's no way that can be right. Using Hodgen extreme powders so the 20 degree temp couldn't have done it. Especially going from 3900 fps to 3600 in a string. Using a RCBS charge master and I'm pretty anal about recalibrating it after about 10-15 charges.

Anyone ever seen this? Tried rebooting and it was still going crazy.

 

[Ohiohuntr]

Probably just a bad read if that was the only one that wide , I’d just delete that one from the string and move on

 

[TradLife406]

Probably just a bad read if that was the only one that wide , I’d just delete that one from the string and move on

Yeah maybe I had the rifle too high on the rest for it to read.


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[HuntHarder]

Looks like maybe only 1 bad reading would be my guess as well. So far my Garmin has been pretty spot on