Originally Posted by Broz
Well you already know the data from a shooting chrony is questionable. As is true with the 3 I own. But this still does not answer the question of why 5" high at 500 and spot on at 750? I am just thinking and asking questions that come to mind. If your 500 yard data is center group and not cold bore it eliminates the barrel stress, stock and bedding idea's. I truly feel there is a glitch somewhere. You stated it is not in scope tracking so I am at a loss. But we have all set up many rifles, I would like to know for sure why this one is off a full moa at only one distance.
Do you have the powder temp data area of the program zeroed? I have seen some wrecks from bad data there.
If I come up with an idea I will post again.
Temp data isnt completely ironed out, and could be questioned but i have been narrowing it down this last year and feel im getting very close.
My problem here is in shooter the temperature variation is linear and im not sure the relationship between velocity change and temp is linear. So i dont know how close is as close as ill be able to get.
There are a few things i dont understand and have in question. Perhaps they could be related to my problem.
Bullet B.C. In relation to MV - ive always trusted bergers published B.C., dont know any better.
Scope height - measuring on canted base
Copper fouling - rifle seems to shoot high (faster) as fouling increases - obvious in rising zero over 70-100 shots.
Factory Barrel - very rough, and copper fouls quickly.
Semi-New Nighforce nxs - seems to track and hold zero identically to last nightforce, but im always suspicious.
Shooter error - im currently struggling with consistancy in trigger control, shouldering the rifle the same with equal pressure, controlling recoil the same way each time i shoot, and managing my reloads to shoot consistent MV, ES, and accuracy.