Major POI shift and need some guidance

[AOR]

Gentlemen,

I am in need of some advice. Let me give you info on the rifle and then the problem.

Rifle:
DPMS in name only.
Kreiger 1-10 18" SS barrel.
PRI rifle length free float forearm.
RRA NM two stage trigger.
AAC 7.62SD MOD 08 suppressor.

Ammo:
Lake City LR118 175GR standard issue.

Glass:
Burris Eliminator II 4 x 12

Problem.
This weapon is zeroed at 200 meters. I fired the rifle yesterday and was SHOCKED to see a 12" point of impact difference. Same target, same lot # ammo. The only difference was temperature. 80 degrees vs. 50 degrees yesterday.

Now, I did break the cardinal rule of adjusting the scope trying to chase the zero in without letting the barrel cool. 32 rounds fired during that exercise.

Any idea why so much change in POI between final 3 shot group from last trip and this 3 shot group?

 

[eric313131]

Re: Major POI shift and need some guidance

I agree with the first poster. Try a different scope. If you still have the problem, then you can explore other options. Read the torque inch pound specs from your manufacture. You'll be surprised at the low amount of torque it takes to secure the scope. If a scope has been over torqued it can have problems holding zero. Do you have any visible marks on the scope? Anything close to the adjustments? So just be careful cranking down those screws. They need to be secure, but no need to snap the head of the bit of in the screw. The only other thing I can think of is the wind. I don't thing the temp had anything to do with it, but if the wind was in your face one day and from your back another. It may have some effect.