Chrono question

[moog5050]

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.  

Edited February 1, 2020 by moog5050

[Marion]

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

Sent from my SM-G935V using Tapatalk

[Lawdwaz]

Yes, I'd say that is just fine Moog.

[airedale]

A 20 FPS deviation is very good uniform velocity and better than average.

Al

 

Edited February 1, 2020 by airedale

[moog5050]

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. 

[Buckmaster7600]

20fps deviation is very good. 10fps doesn’t amount to an inch until 1600yds at those speeds.


Sent from my iPhone using Tapatalk

[moog5050]

Thanks all.  Good to know. I was expecting less but never chronoed a rifle before.