Yesterday while doing some load development alongside another Hide member (308Sako), we each had our chrono's set up. He has an Ohler 35 3-screen chrono with printer and I have my new CED M2. We were interested in a comparison to see how close together they read, so I moved my chrono to line up directly in front of his so each shot would pass through both in sequence. The center of the CED M2 was about 10' from the muzzle and the Ohler was about 15'. They were touching end to end.
Surprisingly, they read about 30-35' fps different BUT the the chrono in front (CED) read slower than the rear chrono (ohler). Both showed roughly the same difference shot to shot and roughly the same ES and SDs, so they were consistant there. I tend to believe the Ohler since it has 3 screens and is known to be more precise. Should I assume my CED is 30fps slow and add that to all my loads or is there another better way to check its accuracy?
Surprisingly, they read about 30-35' fps different BUT the the chrono in front (CED) read slower than the rear chrono (ohler). Both showed roughly the same difference shot to shot and roughly the same ES and SDs, so they were consistant there. I tend to believe the Ohler since it has 3 screens and is known to be more precise. Should I assume my CED is 30fps slow and add that to all my loads or is there another better way to check its accuracy?