If I'm understanding this statement properly... shall we consider one other possible variable in our equation?

"The depth of the cart seating in the breech face of the '303" Bren gun is .055" to .059" and the MINIMUM acceptable CHS is .064"."

As I understand it... The Breech block has also been machined to accept the 7.62 case head in this conversion... if it was inadvertently bored deeper and wider (wider being the only required modification for the conversion scenario - for the cartridge rim) would not replacing the bolt improve our dimensional conundrum? I'm wondering if the cartridges are seating some extra depth in the breech block face and allowing the breech block to contact the BBS.

A .303 barrel and .303 bolt and some locking shoulders is all that Djandj needs to set up the CHS per the last post's instruction - right?