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Chrono question


moog5050
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For those that regularly chrono rifles.  Just chronographed my 6.5 with the 143 eld-x for a scope that I am having made.  Ranged from 2648 to 2669.    Is a 20fps range normal for manufactured ammo.  Just want to be sure my Caldwell chrono is reliable enough.  

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For those that regularly chrono rifles.  Just chronographed my 6.5 with the 143 eld-x for a scope that I am having made.  Ranged from 2648 to 2669.    Is a 20fps range normal for manufactured ammo.  Just want to be sure my Caldwell chrono is reliable enough.  
Seems like it could be especially if not super premium ammo. Gotta figure out what the STD Dev is

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It’s premium ammo so I will just go with average.  I doubt I will ever shoot near the distances that the scope is intended for anyways but I figured I might as well get it right.   It’s about 150fps faster than Quigley Ford estimated so I am glad I chronoed first. 

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