I have been looking to make a device to test and measure the dynamic balance of the projectiles I use in F-Open. I got interested in the effects after shooting 230gr, 30cal, Berger Hybrids in my 300WM. I could shoot consecutive X rings then have a bullet drop/move by a couple of MOA. Initially I thought maybe it was down to the shooter/wind, but I found others shooting this bullet experienced the same thing. I wondered if the unexplained flyers were perhaps due to the bullets being unbalanced and the increase in yaw that it would bring about? After experimenting for some time with methods of holding and spinning the bullets up to a speed suitable for test purposes I think I have made a device that can do the job. I can spin the bullets up to 30,000rpm and use an accelerometer (small sensor) on a low mass aluminium plate which is secured to soft rubber vibration mounts. Using vibration analysis on my notebook pc to test for dynamic imbalance of the bullets. I have only just come up with the solution so as yet no bullet data to present. I am interested in hearing from other forum members who have also pursued this line of inquiring about dynamic balance. Anyone else made a machine for testing bullet balance? Give me some time and I will provide some data on what I find out with my testing.