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base shimming?

 
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  #8  
Old 05-12-2005, 04:52 PM
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Join Date: Jul 2001
Posts: 1,459
Re: base shimming?

Don't bother with a tapered based or shimming. Making the problem more complicated then it needs to be.

Get a set of HIGH (extra high if it will make it under the scope bore distance rules) Burris Sig Zee rings with inserts. Buy a set of inserts (5 , 10 and 20 thou in one box). Put the 20 thou in the rear, 5 thou in the front. Raise the rear of the scope, lower the front. Rezero your scope which will be almost all the way 'down' now.

Go have fun. This is the best and easiest way to shim. Absolutely no stress on the scope tube, don't have to muck about with lapping and all that calculations. Best part is if you change your load and the scope is now shooting too high, swap in less inserts and voila back at it again in 5 minutes.

Oh, you can also rotate the shims to give a variable amount of adjustment. 5 min job at the range. Try doing that with shims - yuck.

With the 270, shooting 500m will need less then 12 min of scope elevation depending on how 'slow' you want to run. That's a big case for silhouette...ouch. You have plenty of scope for the job.

Definitely try the 130gr SST. Way higher BC and superbly accurate. Be careful about stringing. You are using very little powder for that case size and irratic ignition could really screw up your 500m groups.

Jerry
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  #9  
Old 05-13-2005, 11:06 AM
CIG CIG is offline
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Join Date: May 2005
Posts: 5
Re: base shimming?

I think at this point I will shim and lap until I get the results I need. After I'm sure I want to shoot this sport more often I will go with a smaller round - .260 or 6.5 Swede and go with those Zee rings. That is the base powder for that load, but I get .8 7 shot groups with it. If I get stringing at 500 I'll know why. I was getting pretty good groups at 385 aiming above the plate, but stringing might be occuring.

Thanks for the advice.
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  #10  
Old 05-23-2005, 11:06 AM
CIG CIG is offline
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Join Date: May 2005
Posts: 5
Re: base shimming?

Well I went to Gander Mt. and got Shims. Two .012's and one .006 for a total of .030. Lapped both sets of scope rings. Sighted both scopes in at 100 yards. Went to the silhouette range and at 500 meters I still have a turn plus left on the Bushnell. No stringing at 500 either with that load.
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