I am assuming you are using pure lead for your round balls.And pure lead requires the most heat of any bullet alloy. If your bullets are not filling out completely, and have alot of wrinkles, etc., the lead and/or the mould is too cold. Heat the mould up with a propane torch if you need to, to get the bullets to fill out. then cast fast enough to keep the mould hot. They say "if your bullets have a frosty look, the mould is too hot." maybe so, BUT when the bullets appear frosty, they are at least formed correctly. I'll takea well-filled out frosty bullet over a wrinkled, shinyone every time!

I use a Lee pot for my casting, and with pure lead, I leave it at the hottest setting. With a Lee mould, you can put a corner of the mould in the molten lead and let the mould heat up. The lead won't stick to the aluminum. If you are using a double-cavity Lee mould, it may not have enough mass to stay hot from one filling to the next unless you waste no time emptying out the castings and refilling it with hot lead .

If you get the mould hot as it should be, it will take two or threeseconds after you remove the pouring nozzle from the sprue cutter hole for the metal to solidify in the hole. When it is working like this, it should be hot enough.

(This whole time, I have beenassuming your mould has absolutely NO OIL or other such crap in it. You could also paint the mould cavities with the Mould Prep stuff sold by RAPINE Mould Co. It helps you make good bullets.)