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Not enough down travel to zero scope

 
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  #1  
Old 06-15-2013, 03:46 PM
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Join Date: Dec 2012
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Not enough down travel to zero scope

I have a Millet TRS-1 mounted on my 300 ultra mag with a 20 MOA base. I ran out of adjustment on my up and down turret. will not go down any farther. What should I do. Im shooting like a foot high at 100 yards.

Last edited by stihl066; 06-15-2013 at 05:20 PM.
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  #2  
Old 06-15-2013, 07:55 PM
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Re: Not enough down travel to zero scope

I ran out of top adjustment on my 5R .308 with a 20MOA base and had to swap to a 0MOA base and everything works out now.
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  #3  
Old 06-15-2013, 08:22 PM
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Location: Near Napoleon,MI
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Re: Not enough down travel to zero scope

Wow, I looked on the manufacturers website and they do not seem to regard it as important to notify potential customers of the scopes internal travel. Its not listed anywhere, even on the scope manual that I had to find in a google search since there is no obvious place to find it on the web site.

So, in the absence of a specification, have you figured out what the internal travel is ? How many minutes per rotation of the elevation turret and how many total from top to bottom ? If the travel is around 40min (like many of the Nikon scopes) then clearly a 20 min rail is going to be a problem

You could consider putting a shim under the front of the rail (like 1 layer at a time of electrical tape) until you get back into territory where you have got surplus elevation left over. Just don't tighten the front rail screws tight, just enough to maintain contact. Once you work out your shim, then leave the shim in place and put bedding compound between the rail and receiver. You might want release compound between the rail and the receiver if you are likely to need to remove it often, else let it bond to the action.

You don't want to crank down on any of the screws but the back ones where you don't want any "lift" you would snug down tighter than the front. Put the scope on temporarily to verify that you are in the adjustment range. Then let the bedding set up. Clean up any excess compound right away so it looks neat. Give it 24hrs to set up fully, then remove the screws and apply blue loctite and tighten to the recommended spec (now that the bedding compound is cured and can support a load).

Most likely the LR scopes have more travel since they were apparently designed for longer distance shooting...
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  #4  
Old 06-15-2013, 08:25 PM
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Join Date: Jun 2007
Location: Wilmington NC
Posts: 4,167
Re: Not enough down travel to zero scope

Go to burris signature rings and you and use the inserts to get the exact MOA you need. they have 0, 5, 10 and 20 MOA inserts and you cna mix and mtach to 40 MOA.
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  #5  
Old 06-15-2013, 10:20 PM
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Join Date: Dec 2012
Posts: 19
Re: Not enough down travel to zero scope

Wouldnt i want to shim it in the rear of the scope. Since I can not get my elevation turret to go low enough.
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  #6  
Old 06-15-2013, 11:55 PM
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Location: SW Montana
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Re: Not enough down travel to zero scope

No, you have a 20 MOA cant rail which means it's higher in back than front. I respect BountyHunters advice but the Burris signature rings will not last for ever on a RUM, I seen several just not be able to take the punishment, love them for smaller stuff but not for the RUM+ rounds.
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  #7  
Old 06-16-2013, 08:33 AM
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Location: Near Napoleon,MI
Posts: 997
Re: Not enough down travel to zero scope

If the 20MOA rail is installed as it should be, it will tilt the scope downwards by 1/3 degree. Then when you look through the scope, the barrel is raised by 1/3 degree. That allows you to shoot further with a given amount of internal scope adjustment.

1/3 of a degree is not much. You may only need 1 strip of the electricians tape to get you back within the working range of your scope. But given the fact that you are not shooting a 223, the mounting rail would need to be properly bedded in that position. I am assuming you have a one piece rail, that way the rings would still be in perfect alignment with each other and the scope. So you just have to fill the gap that is created between the base and the receiver with bedding material.

In my opinion, it would be the cheapest and most robust solution to the issue while giving you as much travel as you can possibly get out the scope. But don't forget the final step of loctiting and torquing the base screws.
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