Scope Zero Check Thread

[Mw01313]

What rifle and scope?

It's an older Ruger American Predator 6.5 CM in a MDT field stock. Scope is a Zeiss V4 4-16x44 in a set of Vortex rings.

 

[solarshooter]

Tikka 284 with a Tenmile.

 

[solarshooter]

Tikka 6CM with a Tenmile

 

[Hondo64d]

I had previously relied on a ten shot group for zero, but decided to see what a 20 shot group would reveal. Rifle is a Jon Beanland built Zermatt Origin in a McMillan CF Game Hunter stock with a 20” Bartlein 3B chambered in .308, with a US Reaper suppressor. Scope is an Athlon Helos BTR Gen 2.



1st shot was encouraging.



Next 19 were fired five at a time, letting the barrel cool long enough for me to walk down and check the target.


Indeed, the higher sample size, though close, is not a perfect match to the 10 round zero. I adjusted .1mil up, slipped my turret to zero and called it good.

John

 

[Castle Rock]

Are you sure the image displacement from a hot barrel creating mirage didn’t cause the downward trend, we see this all the time here shooting f class and compensate accordingly.

 

[Hondo64d]

I don’t think so. IIRC, the second shot was close to the center of the group. It wasn’t a gradual trend downward, just random dispersion.

John

 

[Castle Rock]

I don’t think so. IIRC, the second shot was close to the center of the group. It wasn’t a gradual trend downward, just random dispersion.

John

I really like these scopes, you may find this interesting
Tall target

 

[ResearchinStuff]

did a zero check on my 6.5 for the first time in a year, last time out showed 1 click low and I wrote that off as shooter error. this time it was 1 click low and 1 click right shooting prone off my pack + bino harness. I'm gonna call it a loss of zero and take it apart to make sure everything is still good to go, mildly disappointed since I have put a lot, a lot of effort into making this setup bullet proof and it did fine on the drop tests in ~2023.

factory tikka stock heavily modified, area 419 rail jb welded on, burris xtr signature rings (likely the culprit, pretty sure the caps are only at 18 in-lb, SWFA 5-20, CGS hyperion.

 

[Castle Rock]

did a zero check on my 6.5 for the first time in a year, last time out showed 1 click low and I wrote that off as shooter error. this time it was 1 click low and 1 click right shooting prone off my pack + bino harness. I'm gonna call it a loss of zero and take it apart to make sure everything is still good to go, mildly disappointed since I have put a lot, a lot of effort into making this setup bullet proof and it did fine on the drop tests in ~2023.

factory tikka stock heavily modified, area 419 rail jb welded on, burris xtr signature rings (likely the culprit, pretty sure the caps are only at 18 in-lb, SWFA 5-20, CGS hyperion.

View attachment 1019828

Lateral shifts wit those rings are not uncommon, the key to eliminating that is to lightly lubricate the angled camming surfaces so that they pull down evenly, running them dry will often make those surfaces offset.
Lateral impacts will then re seat them.

 

[ResearchinStuff]

Thanks for the tip. Maybe just time to get a different set installed.

 

[Castle Rock]

Yeah , I would, I have gone off them a bit.
These days I work out exactly what cant I want and bed it into a good set of rings.