Originally Posted by BrentM
Shot from a bench rest. It was clean and shot the tighter at 7 thru 10 rounds. 15-19 were at 200 on right side, and 20-25 on the left side.
Lapau brass (same lot, shot 2x), neck sized with .002 bushing, concentricity corrected, berger VLD hunting 140, .075 off lands, retumbo powder. Action screws torqued properly, etc.
The fact that the rounds moved up 4.5" at 200 yards with exact same load doesn't surprise you guys? I am very surprised it started shooting high all of the sudden. rounds 15-19 are by a ruler 4.5" lower. That is just weird. I didn't touch the scope settings yet, not even the power, just the parallax.
Before I suspected the scope issue or some other issue I could group this rifle fine at 200 with less than .5 MOA. However, I kept having a verticle flyer issues here and there and point of impact changes that made no sense. This is after a scope bump.
Another thing that surprised was the last round (25) impact that was 2.25" lower than 20 and 21.
I have talked to Night Force and their customer service so far has been very good. It will be 4 weeks before any repair could be made so I am still trying to figure out if it is my base, mounts, scope, rifle, me etc. before sending it in. I am not sure I see any issue from shooter point of view but you never know I guess. Put it this way, I have never had a POI issue changes of 4.5" in my life based on technique. When I was shooting this rifle at 800 yards I consistently grouped .5 MOA....4x4 groups from a bipod and rear bag. A bench would have been better.
The fact that it started shooting higher could be the change in how you shoot at 200 , moving the gun in the rest or whatever . It just seems strange that you can produce a no vertical group at 100 and then the gun goes crazy at 200 . Sure it could be bedding but it could also be something simple like you are digging the sling studs into the bags or the rear bag system is no good .
Or you are not controlling recoil.
The only way to rule things out is to only change one thing at a time.
I tend to agree with Sully2 when he says practise at shorter range and perfect a good style and when the three shot groups get nice and tight branch out to a longer range , but keep the same technique going .
I once helped a guy In Germany took months and dozens of emails but in the end a photo of his gun setup at the range told me what the problem was .
Rear bunny eared bag backwards , Makeshift wooden bench was useless , sling studs still on the gun and digging in .
It is usually what they don't tell you that is the problem.
Changing the scope is always a standard check that you can do just to be sure it's ok . Scopes can do some weird things for sure. I would be surprised if a NF is not holding zero but you never know .
Did you dial the elevation knob to shoot at 200 ?
For the zero to move 6 inch off at 100 after a bump then something had to give . Maybe the erector tube springs are gone in the scope .