Breechplug
Do me a favor if you get a chance, I just got a new Triumph myself and had a heck oftime loading Harvester 40/50 Blue Crush ribs, Harvester Short Black .452/50, BUT the MMP 40/50 loads OK and the HPH-24 Loads perfect as does the Harvseter .452/50 Black Crush Rib... so anyway the favor try pushing a HPH-24 through that bore....