Well, I bit the bullet (so to speak. No pun intended) & ended up solving the problem by finding that the Hornady no1 shell seat works. I don't know if it'll solve Husky1600's problem, although it should both being the same base diameter. Today I converted a few x mil Berdan primed to boxer & they seem to fit the standard Lee shell seat ok. The S&B shells are for a friend that needed ammo pretty quickly so he had to wait until the Hornady seat arrived. Phew, problem solved.
Cheers,
Phil.
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