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Gunsmithing muzzle thread ?

It's going to be a rem varmint or a med Palma finished at 26 inches. So not a sporter, but certainly not a super heavy contour.
that muzzle will be plenty wide enough for a 5/8x24 thread. I would always go with a smaller shoulder if it allowed for a bigger thread. The less meat you take away from the barrel the less chance it might effect the internal dimension of the bore , opening the barrel just .0005" could ruin accuracy.