I will start with everything i did...melted WW "fluxed" with wood shavings and skimmed once, candle once (caught fire and stirred till fire went out) skimmed, borax once and skimmed, poured into muffin pans...loaded LEE 20/4 and turned to 9 all melted and got to 900F, added another muffin and temp fell to 720F. forgot to preheat mold (MP, aluminum, 6 cavity, 115 gr, 9mm) so i put on top of furnace and waited 15 min (drop of water sizzled and turned to steam)...started first pouring, sprue cut a little hard left bullets in mold to heat up mold, bullets came out wrinkled (no surprise), poured second cut sprue as soon as color changed still harder than i thought it would be but it is a 6 cavity, third pour all 6 filled good but sprue was very tough to open all 6 looked good...4 th pour and where i need advise... sprue would not open tried so hard i bent sprue handle and had to get hammer and flat punch to get open, 2 bullets heavy wrinkle and 4 looked great.
big question is whats up with the sprue.