Creeker, I am casting my own design in a .451 470 gr. GC Ml boolet
for a White .451 Muzzel Loader.
http://home.alltel.net/jmose/BigBoolet.jpg I use pure lead with 1.25% tin. With
the hi temps I use I get good edges on the lube grooves and consistent
weights. If it's too cool the edges on the lube grooves start to round off
and the weight starts to drop off. I an quite wary of lead poisoning so I built
a vent hood that RCBS pot is in to avoid any fumes. I segregate boolets
after sizing and applying the gas check and have no problem filling boxes
of 50 with boolets that are +/- 1/2 gr. IE a 1 gr. window for a box.
After that I run them through my Lyman sizer again to lube.
With alloys that have more tin and or antimony and other stuff do not
need so high a temp but for my boolets the high temp seems to work best.
If you are interested in my vent sys send me an e-mail.
Mose