That's too long. Length should be 2.222 inches/56.44mm. Chamber clearance might tolerate a 57mm case but more is getting dodgy. That does not make it the cause but it would be a common denominator if the same load fails in another gun. It could be crimping the boolit on chambering - maybe?case lenth 2.253 inch 57.24 mm
Just a thought based on what I do - it's true that a .314 boolit would not chamber in your gun but the seated portion may be increased in diameter. It will swage down as it enters the throat. My rifle has a taper in front of the rifling leade. I can actually chamber the boolit against this cone and it will seat the boolit deeper into the case. That's not to say yours does.
Is your boolit a gas check design and are you using without a gas check?