I have two Lee one a hollow base mini ball mould that I warped by accident and a hollow point mould that I'm real carefull with, but the best mould for a miniball if your casting for a civil war musket is made by RCBS and its not cheap around 60.00 but worth the money spent is the Hogdon and avilable in different weigths and diamiters, the bottom of the mould does not have a plug that has to be removed, the plug is built into the mould, they also sell a .54 cal mini ball mould as well, hope this helps ..75