Originally Posted by Eaglet
Robbin, and idea just hit me. You know when the mount the chronograph to a tripod, one end is sturdy and the other end would lift up if you push it up. Have you always made sure that the sturdy end is the one toward the muzzle? This is important other wise you'll never get a true reading!
30-338 I hear you! Scary!!!
That's right Jave...... taken from http://www.cedhk.com/shop/product_at...2ManLayout.pdf
A. The CED M2 Chronograph
is designed to prevent error readings due to muzzle blast reaching
the front sensor before the bullet does. When this occurs, the display will not present a reading!
Therefore, it say “0000” only. In the case of large caliber rifles, you must position the end of the
barrel a minimum of 7 to 10 feet behind the first sensor. This will prevent the muzzle blast from
creating any problems. In the case of large caliber rifles, you can position yourself even further
away or design a blast shield. REMEMBER, to always mount the first sensor onto the arm, which
contains the tripod screw hole. This will eliminate any possibility of the “mounting bracket”
shifting upward from heavy muzzle blasts