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Message: <blockquote data-quote="Garycrow" data-source="post: 1550636" data-attributes="member: 30743">And that's probably because the prochrono was in front of the muzzle and the labradar was on the bench.  A bullet will lose about 1 fps per foot of travel so your prochrono being a few feet downrange explains the different velocities.The prochrono is a very good unit for the price, I've been using mine for years and it's done great.  There are some crap optical chronographs out there but it's not one of them.  If I was going to switch to anything it would be the labradar.  I don't see the attraction to the magnetospeed, I'd never try to do load workup with something strapped to my barrel, that defeats the purpose.</blockquote>