The rumor IS that they will be in .310. That only makes sense. It would be a Liability issue in .308. You know absolutely that someone will put hot 310 milsurp in it....I don't care HOW clearly it is marked, or how many warnings..... .308 works well in .310 barrels...so does .310 in a .308 barrel with lighter loads...but if somebody got some real hot stuff it could be dangerous.