I thinned down the head of a 303 case but even though it chambered it wasnt right and it appears the chamfer on the 410 case head is fairy critical on the 410 I have.
Couple that with the cost of three fireforms (3x charges, 3x primers, wads etc) annealing cost, cost of cases and the general fannying around I'll give it a miss.
Looks like Clay and Game for some 410 brass at a quid a go

Does anyone know if Clay and Game in Hull are just an online trader or can mere mortals call in to pick up goods?
I'm over that way shortly so could save myself some delivery costs if I can pick up
