Trigger jerk or off axis barrel?

[Trakker]

So I started playing with a Rem-Age barrel nut setup.

I have a 6.5 CM with a Criterion Barrel heavy barrel setup. During sight in I can get 3 shots touching easily. Rifle and Tract scope zeroed dead nuts at 100 yards.

Now when I go to 600 yards I notice I'm consistent 0.3 mils to the left so I dial it in. Shot after shot I hit a 10" plate. Then when I go back to 100 yards, I'm 0.3 mils off. Is it my trigger technique or this is a real phenomenon where the barrel nut does not really time the barrel into top dead center (TDC), but rather to the side?

[damon1272]

[MongooseV8]

Are you zooming in and out when changing distances? What scope are you using? How much clearance does the barrel have to the stock? How much wind was there that day?

But to answer your question the barrel and bore will never be truly perfectly straight no matter the method. And if you installed a decent quality barrel correctly it will shoot straight.

[Jesse 2]

Double check your bubble level.

[baih777]

I would say you have a real good setup.
from 100 to 600 you will get some spiral drift to the right or left.
that's why when you get your 100yd zero. you zero your turrets.
that way when shooting 600yds. you can drop back to 100yds and zero the turrets.
as mentioned above. changing your zoom will change your POI also.

[WHITE MAMBA]

A barrel nut will not time a barrel to 12 or 6 unless you have chambered and marked it to headspace that way.
.3mils is to much for spin drift at 600yrds

[Trakker]

[hermosabeach]

Are you shooting off of a rest/bench
Prone and a sling?


I have watched some gents shoot 8” groups with irons at 600... besides be amazed they were prone with a sling and they were canted in prone.

The joy of the book is that their position is consistent so the cant is consistent.

So they adjust the shot based upon the log book and the shift in Point of aim/ point of impact due to the body position and distance (lots more too)

[LynnJr]

Your roughly 7-8 inches off at 600 yards from a 100 yard zero?
Could it be the wind?

[mtenenhaus]

LynnJr....isn't there a wind drift and associated change with rifle twist direction as one shoots at greater distances?

[Trakker]

[LynnJr]

LynnJr....isn't there a wind drift and associated change with rifle twist direction as one shoots at greater distances?

There is but it's less than what he is saying he is seeing.
I hate wind flags I prefer pendulums and that might be a better way to actually see what is going on here.
If you could hang a Target at 100,200,300,400,500 and then at 600 you would be surprised what your groups will show you.
I have done 200 and 600 and since the drop isn't very much a standard NBRSA target works well if the range will allow it.

[Trakker]

Trigger jerk or off axis barrel?

Will a collimator tell me scope poi shift with magnification? To me a laser boresighter is useless. I always zero within 3-5 shots.


Sent from my iPhone using Tapatalk

[smoothy8500]

Your scope is fine. A 2-4 mph full-value "breeze" will put slightly more than .3mils or 1MOA windage at 600yds with a 308.

[LynnJr]

Tracker
If you can videotape yourself or have someone else do it. If it's a trigger jerk the yardage shouldn't matter.