3.290"

Finally had time to look at this again.
Used: "Run a fired case into the sizing die just enough to resize about 1/8" of the case neck. Seat a bullet long by hand, chamber the dummy round, close the bolt, remove and measure. Repeat to verify."

Thanks to all.

“Always do sober what you said you'd do drunk. That will teach you to keep your mouth shut.”
― Ernest Hemingway