Ive had a chance to think about a new alloy loading port recently Well, Ive had plenty of time to think (and its a habit I may get into. )
The bore size of the loading post will have to be critical. To large and the pellet will fall through like it presently does with many of the standard plastic ports. To small and it may act as a sizer and the pellets diameter could be smaller than the barrels bore.
Just my thoughts.

ATB
Einstein.