A question to those who use steel block molds: how long do you heat your molds and were yoy keep them during that? top of the pot or beside of it? I kept them beside the pot and waited over 30 minutes so the lead was hot enough, molds were not because every bullet I cast were full of wrinkles and cracks at the grooves and at skirt. Then there was the filling problem, especially with the Lyman .577 mold, half of the bullets were only half or even less filled, RCBS mold did better. This do not occur with aluminium molds, or does this happen because the mold is too cold? So when molds are hot enough for casting? I also used Lee .578 mold which cast too big bullets, but RCBS .578 & Lyman .577 are too small (they slide down the barrel freely), so do they really cast larger ones when properly heated?
Bookmarks