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Old March 4, 2013, 09:36 AM   #50
Bart B.
Senior Member
 
Join Date: February 15, 2009
Posts: 4,382
Sport45, the biggest variable in the way most folks use chronographs is themselves. Us humans don't hold a rifle to our shoulder with exactly the same force from shot to shot. Nor is our body positioned behind the rifle exactly the same for each shot.

Clamping a rifle in a free recoiling return-to-battery machine rest is best for rifles. Barreled actions clamped in a solid mount is what SAAMI uses. Arsenals use a barreled action in a Mann rest; a long V block holding the barrel's fitment rings. Such devices have the same resistance to recoil during barrel time for every shot. Velocities are very accurately measured.
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