UM Tikka rings are not recommended for cartridges larger than 7mm PRC?

[Machingeaneer]

I wonder if they aren't trying to push some sales towards the more expensive "premier rings", they even have "magnum security" in the description for those. I have a hard time believing 4 screws holding a pic rail is stronger than any direct clamp type.

 

[left hunter]

that was definitely not part of the description when I bought my first 2 sets when they were first released. That doesn’t give me a warm fuzzy feeling inside

 

[Kauaihunter]

7mag pushing 150’s at 3150fps, no issues yet. Have switched between 30mm and 1” rings and used the same pins. They seem to be some grade of stainless, slightly magnetic. Have them on my .308 and 6.5 too.

 

[DisplacedHusky]

I don’t recall seeing this on the webpage when I purchased my two sets of UM rings. Would like to see/hear what made them add that disclaimer.

For those of you who experienced bent recoil pins, did you notice a zero shift?

I would like to know when they added that disclaimer, because I don’t remember it being there when I bought my two pair.

 

[Marbles]

For the record, I would still use UM rings without concern. Until this thread I did not really think much about the bent pin, it is a very thin piece of steel and supplied at our (Rokslide users) request for convenience. Screws should be nothing more than a clamp and the friction between clamped surfaces is what provides strength, the screw itself should not be subject to sheer force, the use of those small threaded holes for a pin to hold sheer is a convenience with sacrifices in durability.

If the bent pin is a concern, then limit placement to positions that don't use the threaded recoil pin.

Intriguing -- must be some serious force involved.

Weight of scope, weight of rifle, height of rings?

Total weight 8 lbs 11 oz, low rings, SWFA 3-9 scope. Suppressed. Shooting 108 gr bullets at 2800 fps with 41 gr charge. I used 50 in.lbs on the rail clamp screws, action is cerakoted.

I think that about covers the possible variables.

I don’t recall seeing this on the webpage when I purchased my two sets of UM rings. Would like to see/hear what made them add that disclaimer.

For those of you who experienced bent recoil pins, did you notice a zero shift?

No perceptible change in zero.

I edited my post above to add that I've seen nothing on the site that specifies the recoil pin material. I've only seen aluminum on the page, so that's what I assume they're made of. I could be completely wrong though.

Pins are definitely steel, look to be stainless steel to me.

 

[Marbles]

Ok, I dug them out of the drawer, bend is less that I said, I can see it, but if I didn't know it was there I would not notice just holding them in hand. It is slightly enough I don't think it would show up in a picture.

One ring has a clear mark in the anodizing where it rode against the pin. Perhaps I set the rings up such that initially only one pin took the load.

If I remember correctly, it was the forward pin. But, clearly my memory isn't perfect and I did not find it remarkable enough to document anything at the time.

 

[nm.otter]

Thanks.

A lightweight, not-unbalanced setup -- yet it noticeably bent some fairly tough steel. Wild.

Edit: OK, maybe not so wild -- but indictive of the forces involved in basic operation of the rifle and optic as a system

Oh, right -- Rokslide tests.

 

[Ryan Avery]

This information is new to me as well, and it doesn’t make any sense. I haven’t encountered any issues with these rings when they are properly installed on .300 WSM, 7 Rem Mag, 6.5 SAUM, and three 6UM barrels. However, I have noticed problems when customers do not tighten the clamping screws correctly.

 

[5811]

I wonder if the receiver finish/material makes a big difference on friction, i.e., bead blasted stainless vs cerakote vs blued?

 

[Marbles]

I wonder if the receiver finish/material makes a big difference on friction, i.e., bead blasted stainless vs cerakote vs blued?

My guess is that it does. Nitride would likely provide the least resistance to movement.

 

[Kauaihunter]

I have removed and reinstalled a couple of sets of UM rings between a Blued .270 and a Stainless 7mag, .308 and 6.5CM. Currently running three sets now as the .270 was sold and don’t plan on changing them out.

Not claiming or saying that this is the best way or even the correct way but this is how I install all of mine. As always YMMV.

Cleaned/degreased all contact surfaces of the rings and receiver with alcohol. Clean the threads on the base screws and apply a small drop of blue loctite or vibratite. Lightly oiled the clamping surface of the ring bases and the groove on the action. Small drop of thread locker on the threaded pins and screwed them in as far as they would go, then used a small pliers with a rag to not mar the pins and just gave them a little twist to make sure they are fully seated. Pushed forward on the base to engage the pin with some force and snugged the screws up slowly and evenly, just to make contact. Next, I torqued the screws to 25in/lbs still applying pressure and then increased torque to about 40 then 55 in steps.

My 7mag has been at just over 9lbs total weight and is currently at 7lbs 4oz. The scopes are a 30mm at 28oz and a 1” at 16oz.

Some or none of this may be required but no issues and these rifles are for hunting and two of them are taken on a plane, twice a year for off island hunting trips.