I recently bought one of these models. I always used a buddies before when load developing. I was shooting some factory ammo through a 223 with 22" barrel. It was hornady 40 grain vmaz custom. Box claims 3800 fps from 24" barrel. Conditions were cloudy with the ocasional peak of sunshine. The five shots I shot through the chrony left me with a extream spread of 198 fps. fastes round was 3650+ slowest was 3452 fps? I also noticed that the fastest recorded round was the first shot then it got slower? Could this be the chrony or the ammo? I will be doing some load development this weekend so I will be checking to see how it varies with some hand loads. I'm just not all that familiar with chrony's?