I thought I was doing REALLY well with my casting, so well that I cast-up about (250) .459 x 540 grain 45001's before doing any dimensional inspection. Last night, I was really disappointed to learn that my bullet's driving band diameters vary from .459 to .454...nothing in the way of concentricity / consistency in general. I also noted a VERY heavy amount of antimonial frosting on all the bullets. I thought before since it wiped off easily it was no big deal, should I really be getting nice shiny bullets and not frosted ones?
I am melting Rotometal 1:30 alloy, using a Paul Jones 45001 mold. I run my pot on #10, which seems to give the best LOOKING bullet (minus the frosting).
I am really confused and quite honestly pretty bummed out that the pile of bullets that I thought were perfect are actually all over the place in terms of dimensional stability.
Last night, I tried turning my pot down to 6.5. The frosting subsided, but was replaced by super-dull looking bullets as opposed to nice shiny ones.
Confused. Where do I go from here? Thanks guys.