You know what, I think you're right. Since the shoulder where the threads meet the bore is a stress riser, I would think that the closer to bore size the plug is the better, so long as there is enough shoulder to seal properly. 5/8" sounded better than 3/4," and since Track of the Wolf says that their .50 GM barrels are threaded for 5/8 I figured that was what I wanted....However, that doesn't work out mathematically once you add the rifling, and since GM itself says 3/4x16 for their .50s I have to conclude that Track of the Wolf made a typo and that I'm not thinking straight.
The barrel is not yet made. This particular maker wants to fit the plug himself, but only makes the tubes and is pretty sure it isn't worthwhile for him to make the plugs when there are so many commercial plugs available. 'pears he's right...Problem solved, I guess.
This is what happens when I try to Get Stuff Done instead of think about for awhile. Sheesh.
