Scope slipping?

[Abcdj]

I went to shoot my 300 and 22 today. I just got a new scope and mounted it on my 300. I then put the other scope on my 22 this week.

After shooting the 22 it seemed to go good. I made sure to re-tighten the star screws with a measuring tourque driver on the 300. I struggled with getting the elevation going. It finally seemed to track consistently. I got it close. I was feeling the barrel to let it cool. I looked at the scope. I noticed some marks on the new scope It had slipped forward 3/4"-1" all the way to where the zoom dial had stopped it. I thought wow that is weird. I stopped shooting. I was putting my 22 away in the case and noticed it had done the same thing.
I have mounted plenty of scopes in my time with no problems ever. To have this happen once was weird but twice??

30mm tube and rings. Tightened to specs with a torque screw driver.

Why would they slip?
Why would the scope slip forward?
How to stop them from slipping?

[trophy8]

What rings, rifle, base, and scope?

What torque setting?

[Abcdj]

What rings, rifle, base, and scope?

What torque setting?

Monstrum 6 screws 30mm
Monstrum 20 moa rail
Remington 700 300 win mag
Nightforce nxs 30mm tube
What was recommended on the torque specs.

[SLICE & DICE]

Monstrum rings did the same for me.
Cheap rings not machined correctly.
Sent them back. It's pretty common if you read the reviews.

[kkp005]

Yeah I’d bet the issue is the monstrum rings.

[Mike D]

Scope slipping?

Good rifle, good scope but the absolute cheapest mounting rings and base on the market.

You use cheap mounts and rings on a moderate to heavy recoiling rifle with a fairly heavy scope and this is to be expected.

Get some quality rings and rail and you’ll be good to go.


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[trophy8]

Will agree there

I might have some 30mm rings I don’t need. Will check. Would make a deal if so.

[Abcdj]

Strike from all 3 and I'm out I rekon!
Doesn't explain the 22 slipping thou.

[RifleBowPistol]

Monstrum 6 screws 30mm
Monstrum 20 moa rail
Remington 700 300 win mag
Nightforce nxs 30mm tube
What was recommended on the torque specs.

I bought a Monstrum prism scope a while back, I read a lot of good reviews on multiple of the prism scopes and decided to try one. The base would shift on the rail ever few shots, then the scope would also move around on the base. I think the prism scope it's self was not bad, but the base was poorly designed and the quality of the machine work on the base was a ways from being great. I shot one box of ammo through the gun with that scope on the gun. I took the scope off the gun twice, while going through that box of ammo, trying to get the screws tight holding the base to the scope and then the screw that held the base to the rail. I don't think I ever got more than three shots, before the point of impact changed. I sent it back after burning up that box of ammo.

I am going to bet, the rings and the rail are your problem.

[Raider4044]

Scope slipping?

Willing to bet it’s your rings. Rings are definitely not something to go cheap on. Get you some Seekins, Hawkins, or ARC rings and report back.

Edit: Just looked up Monstrum rings…. Do yourself a favor and chunk that Chinese junk in the trash.

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[rtp]

Monstrum 6 screws 30mm
Monstrum 20 moa rail
Remington 700 300 win mag
Nightforce nxs 30mm tube
What was recommended on the torque specs.

I hate to say it but you need premium rings and a base to go with that premium scope. Monstrom are junk. I used them with some cheaper setups and wasn’t happy at all. Another time you get what you pay for.


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[Sasqy]

Rings !
Lap them and put grip tape in there.
Problem solved.

[Raider4044]

Rings !
Lap them and put grip tape in there.
Problem solved.

Grip tape? Please tell me you’re joking….


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[Mossback]

Rings !
Lap them and put grip tape in there.
Problem solved.

Why would you lap them then put grip tape in there. Makes zero sense

[Sshierry]

was the scope put on the 22 previously on the 300? If so the mark was probably already there.