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Did consider that however I need either a flat surface for the magnets or an adaptor... but as you point out, it will alter the resonance of the barrel.

I had not noticed the resonance at the time I was collecting data as we were only measuring recoil energy, it was not until I started looking at the data closely I noticed it.

It is something I...

Thanks Mimms2... that looks like it... I will have a good read of that when I get back from work later today....

yes that was it....

Will be interesting to learn more..

As for the gear, it is a true accelerometer with a somewhat limited data collection rate... good for big slow vibes ...a piezo crystal is better for higher...

Sounds like a handful under one heading, however I had a play, collecting vibration data, measuring acceleration and G's on my gun, with and without a muzzle brake and found some other interesting...