Mounting problem - Rem 700

Discussion in 'Optics & Mounts' started by Khromo, Oct 7, 2012.

  1. Khromo

    Khromo New Member

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    I recently received a left-handed Remington Model 700 SPS Varmint in .308. I mounted a Brownell's steel Picatinny base, Brownell's Picatinny rings, and a Nikon Monarch 6-24x50 scope. I tried to rough in the zero using a Sitelite 100, and found the scope was looking at a point way above and to the left of the bore line.

    The knobs maxxed out long before I had any sort of a zero. I had decided to follow the shoot one/clean process for the first five rounds, and couldn't get a round on the large target at 100 yards.

    I took the scope and rings off, and completely loosened the two rear base screws. With the two front base screws torqued down, I can slide a .020" feeler gauge between the rear of the base and the top of the receiver easily.

    I am thinking I need to cut a piece of shim stock to fill this space, or use bedding compound to build up the rear of the receiver, but this is uncharted territory for me so I would sure appreciate any guidance! I am obviously not a smith, but I am pretty handy in my reasonably well equipped garage!

    Thanks in advance for any help or condolences!
     
  2. Khromo

    Khromo New Member

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    Looking over the Brownell's site, it seems I can purchase a couple of shims with the correct hole spacing that will fill the 0.021-0.022" gap.

    Is there any great advantage to using bedding compound to fill this gap? Do the shims need to be loc-tited or otherwise bonded in place, or can they be stacked in place and torqued down?
     

  3. hiwall

    hiwall Well-Known Member

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    I would use shims before I ever used bedding compound. no glue or loctite needed on the shims. you can use any metal for shims.
     
  4. ryguy00

    ryguy00 New Member

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    Pop cans work great for shims. Just cut small pieces and test it out. If it looks terrible, dont worry. After testing and deciding what you need to make it work, then you can make it all look pretty.
     
  5. Khromo

    Khromo New Member

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    Thanks for the advice, guys. I will shim that gap. Looking at where it is aligned now, I think that will solve my problem.

    Stay safe!
     
  6. Khromo

    Khromo New Member

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    All right, here is an update.

    I got some shims from Brownell's. I stacked two 0.008 shims and one 0.006 shim under the rear of the Brownell Picatinny base, and torqued it down. I put some Leupold Mark 4 rings on and gave them a little lapping. I installed my new Nikon Monarch 6-24x44 scope.

    I lit up a laser bore sighter, and everything looked reasonably well aligned, so I went to the range.

    A few inches of adjustment, and this rifle was throwing Sierra 168 grain MatchKings straight. I fired four groups at one hundred yards. The first one measured 0.60", then things settled down and it coughed up groups of 0.40", 0.40", and 0.30". This indicated to me that I was having a lucky day, because that wasn't skill, so I went to the local Stop'N'Rob and bought a few lottery tickets.

    There is a good sized gap under the base, so I think I will pack some black grease in there to keep the moisture out. The problem would appear to be fixed, though. I'll keep my fingers crossed, and I will keep loading those MatchKings over 41.5 grains of Reloder 15. Whew.
     
  7. gunnut07

    gunnut07 New Member

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    HUM you shouldn't have to shim the scope mount. Sounds to me like the mount was bad or your rifle is not right.
     
  8. jpattersonnh

    jpattersonnh Active Member

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    My thought was left hand rifle, w/ a standard 1 piece mount for a right hand. Mount is backwards.
     
  9. TCH2FLY

    TCH2FLY New Member

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    Brownell's bases are cut to work with right or left actions ... perhaps a 20moa base on backwards :eek: :confused:
     
  10. Khromo

    Khromo New Member

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    Thanks a lot for the suggestions! I need all the help I can get.

    I don't think the base could be on backwards, as the front and rear mounting surfaces have different radii (Sp.?), with the front being much more round. The screw spacing is different as well.

    My memory tells me I ordered a 0 MOA model, but my memory is even worse than my personal hygeine, so I will check up on that to be sure.

    I recently read on this board or possibly another that this problem is not rare, and it stems from Remington's manufacturing practices. Some guy, who may or may not know what he was talking about, said something to the effect that the round, forward part of the receiver is mostly finished or dimensioned on a lathe, but the flatter mounting surface at the rear of the receiver gets more hand finishing. He said this sometimes results in uneven mounting surfaces, and helps to support the shim market!

    It looks like Brownell's sells a few of those little guys, with correct screw spacings for the front or rear of the mount.

    While I was wandering aimlessly around the garage this morning I stumbled across an EGW base that will fit that rifle. After the initial lust for the new rifle wears off, I may install that base and see if the fit is any better, to see if the base is indeed at fault.

    On the other hand, if this thing continues to print under 0.5 MOA, I may just learn to love it as it is, like a homely woman who can curl my toenails, or an obnoxious neighbor who knows how to fix cars and solve plumbing emergencies. After all, I have a few minor, very very very small, very minor faults myself. Hard as that may be to believe. :eek: :):):)
     
  11. gunnut07

    gunnut07 New Member

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    If you spent hard earned money on a rifle why would you not want it right? If the action is not machined right other things might be wrong inside the action.

    It might just be me but, when I purchase an item I expect it to meet my expectations or the company will fix it or I will return it and get something else.
     
  12. Khromo

    Khromo New Member

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    I do "want it right", Gunnut. But "right" is based on the totality of the circumstances. I wanted a left-handed action, and most manufacturers don't want to hear it. I didn't want to spend too much, because I'm just getting started in rifle shooting and I don't know what I'm doing yet. Remington says "Come on in, join the party. At the bottom of the line." That's the best offer a hard world had for me.

    I would have liked that rifle to be closer to perfect, or "right", because knowing those shims are there bugs me, it messes with my sense of order! But in my opinion it's not reasonable to expect much more out of a made-in-the-U.S.A. rifle that cost $700. For me, it is a matter of having realistic expectations.

    I have had a hard life. My hopes and dreams and fantasies about a near-perfect world were shattered decades ago. I look in the mirror, and I say "I look like a puddle of dog puke!", and I'm not kidding. But this is as close to "right" as my experience allows for, so I try to live with it gracefully.

    I have to live in the world the way it is today, not the way I might like it to be! :D
     
  13. hiwall

    hiwall Well-Known Member

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    Your gun shoots awesome. Those shims are fine. Leave it alone. Just take it to the range and shoot the socks off everyone else!
     
  14. Khromo

    Khromo New Member

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    That's how I look at it, Hiwall. The gap isn't right, but war, pestilence, disease, racism aren't right either. We need to play the hand we are dealt.

    I would be upset if it couldn't shoot good groups. That would be a big deal. That varmint barrel is heavy! It better shoot straight if I have to lug that thing around!

    Spending a couple of bucks on the shims, and half an hour at the workbench is not a big deal. I learned something, and maybe someday I will be able to help out somebody with the same problem. And if I do enough good deeds like that, maybe I will not wind up burning in Hell for all eternity! This is starting to look like a great deal!

    It is not pretty, but the way it shoots, well, I am getting a little aroused over here. Is that wrong?!?!
     
  15. ryguy00

    ryguy00 New Member

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    You would be surprised at the number of competition benchrest rifles out there that have shims in some place...
     
  16. 1911er

    1911er New Member

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    Shims arn't bad I have.010 worth under my vx-4 sitting on top of my 1971 browning BAR in 270 win. shoots like A dream.