Mat,

The recessed chamber heads ( I am assuming you mean towards the back of the cylinder ) were initially cut when brass was made in the "balloon" head configuration ( the brass was folded over to form the case head ). This would protect the shooter in the event of a case head failure, the weak point of the brass ( at least that was the rationale ). Cases have been made with solid heads for many years; hence, the need for case head recesses is not. Some manufacturers have maintained the practice ( Freedom Arms ). Again, "I am assuming this is what you meant. Hope this helps.

Doc