Thread: Funky speeds - Riddle me this

Hi team,

I have a load that is grouping well enough- Barnes TTSX 120g with H335 - 5 shots at 100yd (0.7") and 5 shots at 310yd (3") in my 7mm08 bushpig. 300yd is roughly my limit. I've measured drop and re-calculated velocity to be about 2940 fps plus or minus.

I have also measured velocity on two separate days with two separate chronographs. Each time the first shot read about 2920, which should be about right, and the following shots varied between 2770 and 2900. I checked the chrono with my 7mm Rem Mag and it was very consistent and gave roughly the expected velocities.

Has anyone encountered funky readings like that with certain loads before? I trust the groups and the drop over the chrono, but it was interesting that it happened on separate days with different chronos.

Cheers,
Elliott