Recently bought 5/6 oz plain lead mould i have to admit it was cheaper than say dca but what a load of crap leaks like a good un i have been told this is the norm you just have to spend time trimming thats ok if you just make a couple once in a blue moon i like to make a load drag out all the moulds from 3 to 6 plain and grippers do it all and sell a few to cover my time so if its a good quality lead mould your after hold it up to the light and look through the seam if its warped and gappy yes its a RON THOMPSON drop it and run.