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Maybe rotate the barrel, instead?

July 1 2017 at 8:12 AM

Bob D.  (Login MB-BOB)
YF


Response to Scope issue on my Thomas FT rifle. I have my Sightron 10-50X60

Since the Thomas does not have a transfer port in the barrel, I presume the barrel can be loosened and rotated, in your case CCW to a POI further left. I'm told RAW TM series rifles (also no TP in the barrel) have barrels indexed at the factory to shoot vertically throughout the 10-55yd range. This way, the scope's reticle can be optically centered (ideal) and POI will coincide downrange.

My TM1000 required only one click of windage (from optical center) to be bang on, and hasn't varied since new.

Luck of the draw (and very rare) if you get any rifled bore that is exactly concentric with the barrel's OD, or a barrel that is exactly straight overall. If the barrel points naturally to the right, you won't see it at 10yds, but it will be apparent at 55, as you've described. Put that barrel in a lathe and spin it slowly, and you will see the muzzle wobble...

In this case, you may find that aiming the barrel is more precise than fiddling with scope rings (a band-aid solution). The Thomas design permits it (I think), and just 5-10° of rotation might do it to perfection. Heck, just loosening the set screws to relieve any tension on the barrel and then re-tightening might do the trick.

I'm sure Mike N. can walk you through this, Don.
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www.DallasFTclub.org


    
This message has been edited by MB-BOB on Jul 1, 2017 8:39 AM


 
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On line trajectory calc by Brad Troyer MILDOTS

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