02-16-2019, 04:28 PM
Bigs28 Wrote:Caldwell chrono about 3 feet in front of my muzzle.
Does something look off?
No, just was wondering if you needed to back-calculate actual mv. A word on chronographs:
If you place an optical chronograph close to the muzzle, your readings can be skewed by muzzle blast moving the unit, depending on whether or not the face of the chronograph base is within the blast wave propagation of the muzzle.
I've seen some video of guys testing a 6.8 that way, and you could see the chronograph rocking back and forth with each shot.
NRA Basic, Pistol, Rifle, Shotgun, RSO
CCW, CQM, DM, Long Range Rifle Instructor
6.5 Grendel Reloading Handbooks & chamber brushes can be found here:
www.AR15buildbox.com
CCW, CQM, DM, Long Range Rifle Instructor
6.5 Grendel Reloading Handbooks & chamber brushes can be found here:
www.AR15buildbox.com