What is going on here with my Sendero scope base?

[pete6520]

So I have this brand new Sendero I am working on.... I mounted a Nightforce one piece base on it, and was getting ready to mount my scope. But as you can see in the pics, when I put a level on the base, the rear of the base reads much differently than the front. I originally put a Weaver base on it and thought that the cause of this was the Weaver base. So I sprung for a Nightforce but have the same results... I have a quality machinist level by the way, but for the pics the cheap plastic level shows better... The holes all lined up nicely... I don't want to continue on and attempt to make this a shooter if this is a problem... any educated opinions out there??

 

[Defens]

The holes might be lined up in a row, but that line could be off axis to the centerline of the receiver, perhaps. Try putting a precision straight edge along each side of the base - it could be getting warped when you tighten the screws down. Also, take a straight edge and line it up along all the mounting holes and see if it points directly down the barrel, or is it cocked off to one side?

Or, for that matter, check the base against a flat surface when it's off the scope - Nightforce is very high quality, but perhaps a scope mount slipped out that was warped. However, this seems unlikely since a different base did the same thing.

 

[Punisher]

There is probably a little warp. You can measure this around a cylindrical action, but I'm not going to bother describing that. The answer is in the rings. This is why we lap the rings. If the base is tight, lap the rings so it doesn't torque on your scope. there isn't a single perfect action on this planet.

 

[pete6520]

Thanks for the replies... so when I mounted the warne rings onto the base when it torqued down, the rear right if visibly tweaked way to the right... When only the front of the base is torqued down the whole base remains level... So the rear of the base is not machined level, thus I will bed the rear of the scope base with the JB Weld process.. It stinks that one thinks he is buying a precision rifle from Remington and ends up with this kind of results... I should have gone custom right off the bat, but wanted to save a few bucks... next time!

 

[J E Custom]

Thanks for the replies... so when I mounted the warne rings onto the base when it torqued down, the rear right if visibly tweaked way to the right... When only the front of the base is torqued down the whole base remains level... So the rear of the base is not machined level, thus I will bed the rear of the scope base with the JB Weld process.. It stinks that one thinks he is buying a precision rifle from Remington and ends up with this kind of results... I should have gone custom right off the bat, but wanted to save a few bucks... next time!

This would be a good case for bedding the rear part of the base. with the front screwed down.

http://www.longrangehunting.com/forums/f37/bedding-scope-mount-136628/

This is a good way to do it.

J E CUSTOM

 

[pete6520]

I should proof read my posts... what I meant to type was " when I mounted the Warne rings onto the base when torqued down, the rear RING is visibly tweaked to the right.... So the rear of the RECEIVER is not machined level....
That link to the bedding video is the process I will use... Thanks!

 

[Punisher]

I have read that post about the scope mount bedding. It is good info, and JB Weld is my preferred compound for all bedding. Good luck with that, try to follow up if you can and let us know how it turns out.

 

[Mateo]

It helps if your action is bedded stress free in the stock. Otherwise your action screws can be warping the action itself. And when your change torque settings on your action screws your accuracy will suffer. So bed your action if you haven't already.

 

[pete6520]

So I did the JB Weld scope base bedding process as recommended earlier in this thread... I used the Kiwi neutral shoe polish for the release agent and Play-Doh to plug the holes in the scope base. It cured for about 8 hours and popped off with little effort. The stainless receiver cleaned up easily with rubbing alcohol. It is hard to believe a new Remington Sendero receiver can be so bad... You can see in the pics the amount of JB needed to level things out... I am waiting now for it to cure fully before cleaning the edges up and re-installing on the rifle..

 

[Canadian Bushman]

I never have understood why remington feels the need to mill a weird radius on the back of their actions but i credit 90% of rail misalignment to that feature alone.