Scope Rotation?

[Methuselah]

Thinking about this again:  When you cock the rifle, is it smooth or not?  My understanding about coil springs is that when compressed, they rotate a small amount.  If there is a burr on the end of the spring, that may be causing a bind when the spring is unsprung as the ends of the spring will rotate. 

If the spring is getting caught in rotation, that will give you a torque recoil, noisy and harsh, and may be why the scope is rotating.  IF it were mine, I would check with the Mfgr. and see  about a return and replacement.  If you are not worried about warranty, I would take it apart and polish the spring ends and check for a smooth bearing surface for the spring.

I probably don't know what I am talking about, but seems reasonable.

Good luck!

I suppose that could be it.  I do hear the twilight zone theme playing in my head on this one (it's a gas ram, but maybe!).

[Methuselah]

I've had more than 1 set of poorly machined rings. Bought a 30mm set a while back and scope was loose, no matter what i did it even tightening it all the way down the scope was still pretty loose. Measured the gap with it tightened all the way down with calipers and it was 34mm at the largest point and 32 at the smallest.

Now that's an idea I can sink my teeth into Matt!  I believe even if a high-spots issue is at play - odds are that the gaps will show up something fishy.  Maybe stacked feeler gages to check, or just a caliper 

Also, have contacted Leapers and asked if they can lap the rings if I send them back.  Answer was no - but the guy writing back did ask lots of questions and hinted they may send me out a new set of rings.  I'm still working on the wife where spending more on the bottomless pit is concerned about buying a lapping kit for 30mm...

Thanks again Matt, I'll post the measurements if I get the chance to do them this weekend (having a sweet 16 party for the rugrat  )

[R1]

Sorry...Did not realize that it was a gas ram.  My error.

[William]

I've had more than 1 set of poorly machined rings. Bought a 30mm set a while back and scope was loose, no matter what i did it even tightening it all the way down the scope was still pretty loose. Measured the gap with it tightened all the way down with calipers and it was 34mm at the largest point and 32 at the smallest.

Now that's an idea I can sink my teeth into Matt!  I believe even if a high-spots issue is at play - odds are that the gaps will show up something fishy.  Maybe stacked feeler gages to check, or just a caliper 

Also, have contacted Leapers and asked if they can lap the rings if I send them back.  Answer was no - but the guy writing back did ask lots of questions and hinted they may send me out a new set of rings.  I'm still working on the wife where spending more on the bottomless pit is concerned about buying a lapping kit for 30mm...

Thanks again Matt, I'll post the measurements if I get the chance to do them this weekend (having a sweet 16 party for the rugrat  )

You cannot lap a set of rings without them being mounted to the gun in question, you may be able to only if it just has some out or round spots or high spots!

The purpose of lapping the rings is when you have them mounted it levels and contours the rings to fit with the receiver mounting area, this way if the receiver is off a little the lapping bar makes the rings and the scope sit true to the receiver or mounting block.

If the rings are too loose, you could use a flat file and take some material off the flats where the ring bolts go through and tighten down! That is if when you tighten the caps all the way there is no gap where the caps meet the bottom flats. Not sure if that is the problem or not, but to be honest it really sounds like the gun needs tamed down with some piston polishing and a good tune!!!

Your fighting this battle too hard I think, A lot of good people have given you some good ideas on how to solve the problem and I know its hard to do being your worried about warranty! I would rip into it and tune it or send it to someone to tune it for you, warranty would be my last concern at this point, you know you have a good gun it just needs a little tender loving care to make it and you happy!

Good Luck and I hope you come up with a solution:

William

[seitg74]

Reading this I thought it was a spring and surprised it is actually a gas ram.  I purchased my Hatsan 125 .25 from Pyramyd and ordered not the Vortex but the Nitro Piston installation.  I have very little  vibration, easy to shoot, not hold sensitive, very moderate noise level.  I had a Striker Edge that was very loud, twangy, and hurt your ear next to the stock.  Noticed the velocity was way too low so I sent it back.  The replacement was way smoother and velocities correct.  So its probably way too rough in there.  I got frustrated with the scope situation also as it just sits way to far forward.  I shoot it open sights now and consistently hit bottle tops at twenty yards. I have grown tired of the magnum springers myself and am thinking about selling them all for a Weihrauch 30, 50 or just one of those Slavia 634s that are making my mouth water but they are you darn ugly! Good luck with your 125. T

[Methuselah]

If the rings are the right ID then the tube should not be happening. That being said a de burr polish and lube tune should cure that problem I certainly solved my scope killer D460 Spun the Reticle on 2 scopes before the lube and tune Just make sire that you se burr and polish the spring ends also

Don,

You were soooooooooo spot on, it should not be happening.

It took me a couple weekends to get out there in the back yard again and set up everything, bubble level, fixture to hold the rifle, something down range to tie off the plumb bob and start over with checking out how much it moved.  Maybe the level isn't perfect and both rifle and scope are canted, but alignment between the two is exactly as it was when I set it up --- if it's off, the relationship between the two is fine and there is no shift in poi at various ranges (just cra**y marksmanship and less than spectacular groups).

I should have known, as I'm probably about the only person on the planet that can't hang a picture strait to save my life even with a proper carpenters level!

Thanks so much for all the replies everyone!  Next time I'll double check before crying in everyones soup...


Methuselah (feeling older but wiser, not so much)

[Sfttailrdr46]

  Some ,myself included learn better from my mistakes than advice and guidance from others. Sometimes I just need to take something apart to see the guts before I sinks in