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Here's my mould but it shows 2 different type top punches, SAECO and Lyman, I have RCBS. Clearly I'm missing something, or I'm an idiot.
You are not a Idiot, so you are missing something.:-) The top punches you note are for your mould. There are 2 options for this top punch. One to work with a Seaco type sizer or one to use with a Lyman 450/RCBS LAM type sizer. This top punch will not work with a Lee push thru die as they feed nose first. If you buy this top pinch it will fit the nose profile of bullets cast from this mould.