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Got a set of feeler guages?

Get them, remove the barreled action and loosen the barrel clamp just enough to let the barrel move forward to the right spot.

Now, group feeler guages together to just fit the gap between the front of the receiver and the shoulder of the barrel shank (holding action vertically, with the muzzle down might be easiest). You can just add the numbers on the guages up, or measure the whole group with a caliper.

Beg, buy, or build a shim the same thickness.

Artifex's shims could be thinned by hand on a flat surface with sand paper... slow but it'll work.

Good luck.
 

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One of the best in the business (IMNSHO) is Randy at Connecticut Precision Chambering.

www.ct-precision.com

I'll bet he could "adjust" a heavy barrel for the Ruger to fit an AMT receiver.

Best to call him at: 1-860-343-0552. Let it ring for at least 10 rings as he is usually busy, but will answer all your questions.

Excellent work, quick turn-around and a genuine good guy.

FWIW
 
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