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Ring slippage

 
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  #1  
Old 12-28-2009, 12:31 AM
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Join Date: Oct 2007
Location: Darwin
Posts: 14
Ring slippage

Gday Fellas,

I went down the range to sight in my 338LAP.

I'm running a VX3 6.5-20X50 in MK4 rings. After about 10 good groups the POI changed and I noticed my scope had slipped AFT (thats right AFT not FWD) by about 1/4inch.

The rings were lapped and torqued to 40in/lb.

40 in/lb is pushing the limits for the screws so I'm reluctant to screw them down harder.

Any suggestions?? I'm considering a 3rd ring.

Chhers in advance

Tadge
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  #2  
Old 12-28-2009, 01:10 AM
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Join Date: Dec 2001
Location: Mukilteo, WA
Posts: 1,091
Re: Ring slippage

40 is way more than necessary if everything fits together correctly. Check to be sure you didn't overlap them such that the ring halves are contacting each other instead of clamping the scope.
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  #3  
Old 12-28-2009, 01:28 AM
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Join Date: Oct 2007
Location: Darwin
Posts: 14
Re: Ring slippage

Gday Jon A,

Rings still have a few thou gap either side.

I'm a bit lost on this one.

Tadge
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  #4  
Old 12-28-2009, 02:14 AM
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Join Date: Mar 2008
Location: N. Central Indiana
Posts: 563
Re: Ring slippage

Was everything degreased before assembly?

Just to get an idea of recoil velocity, what bullet, speed, and wt. of the gun? You're right, I wouldn't torque the screws any more.
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  #5  
Old 12-28-2009, 04:06 AM
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Join Date: Oct 2007
Location: Darwin
Posts: 14
Re: Ring slippage

Gday Esshup,

Load is 97gr AR2225 behind a 250gr pill. Did not chrony this load but should give around 2850fps.

Have not weighed the rifle but should be around a total weight of 13lb.

I have taken the rings off and cleaned them was not any grease or oil underneath.

Tadge
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  #6  
Old 12-28-2009, 05:57 AM
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Join Date: Jan 2007
Location: PA
Posts: 1,095
Re: Ring slippage

Try a little powdered rosin under the rings. Do not overtorque and bend the scope tube.
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  #7  
Old 12-28-2009, 01:04 PM
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Join Date: Mar 2008
Location: N. Central Indiana
Posts: 563
Re: Ring slippage

Recoil velocity is approx 12 ft/sec and recoil is 29.5 ft/lb. (that's without a brake)

If you take the rings apart, double check that there is a gap, and check that the screws aren't pulling up the first thread out of the bottom ring, interfering with the top half tightening down if there's only a couple thou of clearance. The rosin is a good suggestion.

If you have a correct sized tap, I'd also check the bottom ring half to ensure that the threads aren't getting pulled out of shape. If they are, I don't know of a way to fix it other than going one screw size larger if you have access to equipment to do the job.
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