Great picture Am i seeing it right? It appears that there is metal flow from the land impression that remains proud of the full diameter of the bullet that starts at least from the last groove to the base of the bullet.

If so - that means that the bullet is slightly undersized and it appears that the full thickness of the bullet is not riding on the groove of the bbl. Or in other words, the lands push their way into 90% (or so) of the bullet diamter, but even then, there is still room in the bbl for the bullet metal to extrude out from the full diameter of the bullet.

It stands to reason, that in this particular rifle, there is in my opinion, little chance that a bbl will bulge to accomodate this "undersized" round. Unless the steel of the bbl will expand in sectional area easier then the metal of the bullet shearing away. I think that the metal of the bullet would shear far easier and quicker then an expansion of the bbl steel.

Just my layman's views.