Interesting. I use my LR with .22 rimfire and .223 so I have a bit of experience here. So a question: what did the signal return strength bar graph on the left side of the display indicate?
My experience is that it's a bit harder to get a 5-bar return with .223 boat-tail bullets. I can also say from experience that readings from weak returns are suspect, typically on the low side.
One thing I've started doing that helps a lot with triggering: I use my little microphone, originally intended for rimfire or suppressed triggering, all the time. I put the mic under the muzzle and set the appropriate trigger level and velocity range. I often shoot braked and un-braked rifles in the same session and it's nice not having to move the unit.
Finally, in checking the LR documentation to insure I'm using right terminology, I noticed this advisory regarding transmitting strength. I might have to play with this - I occasionally use one short (initial sight-in) range that is cluttered, and have gotten some spurious readings there.
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TX Power (US, Canada, Australia/New Zealand models only)
Select the LabRadar transmitting power. (Standard or Low). While Standard power offers a longer range measurement range, the Low power mode can be useful and perform better on shorter or indoor shooting ranges and on ranges where object create signal reflections. Due to foreign government restrictions, the European Union model is restricted to the Low power setting.
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Thanks for the video. "A man with a watch knows what time it is. A man with two is never sure." - unknown