I have read those specs 9.3X57 and one must remember that .316 was considered the end of servicable life. Now the grove diameter might not be the reason for the rifles inability to shoot to an acceptable degree, that is why when my LGS told me that Ruger said it was within specs I told them to tell the importer to get it to shoot before they send it back otherwise rebarrel it.

The rifle just will not shoot factory loads so in my mind it is a defective item. Just have to wait and see what happens.

In my opinion it is still poor form for a modern company to make a barrel that grove size is not far off the end of it's service life. Rembering that, that service life is for a military (Infantry) rifle. The figures published are at the upper end of what the grove sizes where that came out of the factories. Grove size was acceptable from .310 to .316