If you can find them. Fiocchi primers should resolve you problem. If those here can remember how tight the old Alcan primers were. Fiocchi resembles Alcan's to a T. Otherwise maybe a sealer may help. Which is something I don't use myself. Just Fiocchi's only. If my reloads were to leak a little I don't care. Because I reload over current listings and in doing so it is expected but hardly ever seen. So long as my rifle stays accurate fellers. I'm happy.
"JUST A OLD DEPLORABLE THAT'S IRREDEMABLE."