I'm just started casting 710gr WFN for 500 S&W. I'm getting some small voids in the nose section and I think it's from pouring too slowly. The holes in the sprue cutter limit the speed I can pour.
I'm a fairly experienced caster. Mold is preheated well, pot temp is 850F or a bit higher, fill out on the lube grooves is perfect. Alloy is 4% antimony 2% tin, balance lead.
But there are swirl marks and some small voids in the nose section. I think I need to get alloy into the cavities faster. The bottleneck seems to be the size of the holes in the sprue cutter.
Has anyone else experienced this? Has anyone enlarged the spue cutter holes? I'm thinking of trying that but now that I'm old and smart(?) thought I'd ask here first before I start drilling holes. Thanks in advance.