need help my 0 keeps drfting

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10 years 8 months ago #38181 by Turbo V6 Camaro
need help my 0 keeps drfting was created by Turbo V6 Camaro
so i have my 308 and nikon scope for about a year now, it seems i can set a 0 and it will drift

then if i leave it sit the first couple shoots are on target and then after more rounds it seems to drift. (low right)

This is my first thread

www.ar15.com/forums/t_8_32/545901__ARCHI...STL_area.html&page=2

I had the chance to shoot some more

when i first put rounds down range it was only about 1-2 inch high and 1-2 inches left.

as time passed it moved around and started sinking low right (one left handed and one right handed shooter) (80 round tops)

was hard to even hit a 3 inch target at 100 yards

I plan to throw a couple rounds this weekend and see what it does.

was shotting from a bag and use shoulder for the back, will have 2 bags this time out

Thoughts ?
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10 years 8 months ago #38184 by Akai
Replied by Akai on topic need help my 0 keeps drfting
Looks like you got some good advice for the most part.
If you took it and did all these things, I'm thinking it's probably in the scope.

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10 years 8 months ago #38185 by Libertarian623
Replied by Libertarian623 on topic need help my 0 keeps drfting
Good to see you again Turbo. Well I guess your post says it all its wandering. So I will eliminate shooter error if your not comfortable eliminating shooter error have another shooter give it a goo if the results are the same then I say move on to hardware.. That leaves just three elements the mount, rifle and scope. I would throw out the rifle, what you describe does not indicate a rifle problem to me. So the mount, lets start there, I would go through every connection made and torque to spec every bolt and screw, pay attention to the all the hardware not just the mount. Next if that does not reveal a problem move to the scope and do some return to zero exercises. If you are getting errors returning to zero from say 300-400 then to 100 then you have a problem and call Nikon, the scope is covered. Another way to check the scope is use the turrets to walk the rounds around the paper and see if the adjustments correspond to what you see on the paper.
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10 years 8 months ago #38193 by OleCowboy
Replied by OleCowboy on topic need help my 0 keeps drfting
Go with iron sights on a 25 meter range with the proper zero target. If its drifting then you can elim the scope, then its shooter or gun...let us know how this progresses.
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10 years 8 months ago #38213 by NightForce
Replied by NightForce on topic need help my 0 keeps drfting

Libertarian623 wrote: Good to see you again Turbo. Well I guess your post says it all its wandering. So I will eliminate shooter error if your not comfortable eliminating shooter error have another shooter give it a goo if the results are the same then I say move on to hardware.. That leaves just three elements the mount, rifle and scope. I would throw out the rifle, what you describe does not indicate a rifle problem to me. So the mount, lets start there, I would go through every connection made and torque to spec every bolt and screw, pay attention to the all the hardware not just the mount. Next if that does not reveal a problem move to the scope and do some return to zero exercises. If you are getting errors returning to zero from say 300-400 then to 100 then you have a problem and call Nikon, the scope is covered. Another way to check the scope is use the turrets to walk the rounds around the paper and see if the adjustments correspond to what you see on the paper.


There a ton of great advise here! :twothumbs:

In addition, if you can detect scope movement or creep in the scope rings they may need to be addressed. Adding a wrap of plastic electrical tape will tighten up things nicely.

Remember, most clicks will result in 1/4" change in impact point at 100 yards so you may have to do 3 or 4 clicks to detect this change.

I'd also have another competent shooter give it a test drive to corroborate your findings...

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10 years 8 months ago #38214 by faawrenchbndr
Replied by faawrenchbndr on topic need help my 0 keeps drfting
It is either the scope or the mount/rings

Get to a 25 m range, set up on bags and slowly "shoot the box"
Be careful to not warm up the barrel.

Take a shot to zero.
Adjust the scope 12 clicks left, take a shot
Adjust the scope 12 clicked down, take a shot
Adjust the scope 24 clicks right, take a shot
Adjust the scope 12 clicks up, take a shot
Adjust the scope 12 clicks left, take a shot.

Where did the last shot impact?

Remember to take your time, do not heat the barrel.
Do not pull shots.
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10 years 8 months ago - 10 years 8 months ago #38227 by MrMarty51
Replied by MrMarty51 on topic need help my 0 keeps drfting
Now that is a nice process Faawrenchbender.
Also, bag the rifle down good and tight at 25yd/M targut. put scope on bull of targut, take Your second shot, without moving rifle, adjust the hairs so thet they are dead onto that second shot.
Your scope should now be zeroed to the rifle.
Now, move to the 50yd or M targut range, take a shot at that one, adjust scope as necessary. If it is adjusted a couple inches high, I`d leave it.
Practice at the 50yd/m targut for a few rounds and see if the scope still drifting.
Last edit: 10 years 8 months ago by MrMarty51.
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10 years 8 months ago #38239 by faawrenchbndr
Replied by faawrenchbndr on topic need help my 0 keeps drfting
I always "shoot the box" to prove a new scope. Great technique to gain confidence in the glass and
ensure the optics' internals are solid. Here is my last test subject......


Remmy AAC-SD
Timney 510
Badger 20 degree base with lug
Badger standard .823" rings
Nightforce 3.5-15 NXS, zero stop, MOA
Manners TF-3 stock
Atlas

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10 years 8 months ago #38241 by NightForce
Replied by NightForce on topic need help my 0 keeps drfting

faawrenchbndr wrote: I always "shoot the box" to prove a new scope. Great technique to gain confidence in the glass and
ensure the optics' internals are solid. Here is my last test subject......


Remmy AAC-SD
Timney 510
Badger 20 degree base with lug
Badger standard .823" rings
Nightforce 3.5-15 NXS, zero stop, MOA
Manners TF-3 stock
Atlas

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I find I fall in love a lot on this forum..... :drool: :drool:
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10 years 8 months ago #38242 by faawrenchbndr
Replied by faawrenchbndr on topic need help my 0 keeps drfting
I just hope it will shoot worth a piss,........Typo in my last post. Was supposed to say "next test subject"

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