It was terrific with 777 Winchester primers. Loves 80gr. 777 powder, and a 245gr Powerbelt balistic tip.... I like the primer carrier barrel better, cause I don't have the rod on it, and I don't need a small screwdriver, to pick the spent primer out... That being said ... I never had a tool for it, as I just used a big screwdirver, or a couple of pieces of metal duct taped together, for a breach plug wrench.... I interchanged barrels and plugs a lot... Hope you have the success I had, it's a shooter! Never noticed that the plug was any heavier than the primer carrier plug... again, great success.....