Wyatt, the bullet I have been using is cast from a mould I had made by "Accurate Molds".
It is catolog #285C. Cast from wheelweights, it is 285 grains as cast.
I had the mould made to cast the bullet to .372" +.002/-.000".
I seat a .375" gascheck with a Lee sizing die made to .372".
Once the weather warms a bit I will continue my experiments and will post everything I have discovered on this journey right here on this forum for all to see.