how to chrono a GBBR?
Hey I got a quick question.
When at a field and its time to chrono guns, how do you guys chrono in your GBBRs.
With a GBBR I have read alot of places that a heavier round can actually up the FPS if not keep it the same as the lighter round as its in the barrel longer to allow the gases to expand behind it. So do you use .20s? or do you use what you will be playing with.... or do you calculate in energy?