I have a Husky 4100 30-06. I am attempting to measure for OAL with Sierra 165gr boat-tails.

With the bolt in, I marked a cleaning rod inserted into the barrel. Next, I installed a dummy round with the bullet seated out farther than normal in the chamber and held it in place while remarking the rod.

Measurement ~3.125

This is way short! The load manual calls for ~3.300 If I seat at that depth I have a hard bolt push. With the 3.125 the bolt moves smooth, as it should.

With the bullet seated at 3.125 it is so deep it that the case mouth is on the ogive.

What am I missing here? Can the chamber really be that short?

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