Unfortunatly no photographs allowed :-(

HOWEVER.

I am now the owner officially of a .450" 2 Sleeved 3500 BAR

As that is what is stamped on the lumps.

It was an interesting experience. The test itself consisting of taking two of my heavy crimp maximum reloads and librially oiling the cartridges and firing them in a test room that resembles the entrence to Dantes inferno with a huge ammount of powder residue on everything.
A nicer bunch of people you could not hope to meet by the way, they let me observe all that was going on and made me a cup of tea to drink whilst wandering around their workshop.
They also decided that the test was sufficient for definitive proof and that I did not need to return the rifle after the ribs were added.

I enquired of course just what additional strain the oiling of the cartridges puts on the action and I was assured that it was in excess of 30%. I was told with some undisguised pride that the same proceedure had recently pushed a .600 by a well known manufacturer off the face. This was before they fired my humble effort (gulp). The excess pressure produced was sufficient to force the primers to extrude into the firing pin holes 0.0085" to the extent that a burr could be removed from the primer with a fingernail on examination.

Now to regulate her and affix some sights and ribs.