Hey bruce381, welcome to the forum. I somehow missed your arrival.
What rifle do you want to shoot cast in? What purpose do you foresee for that rifle? Paper targets, long range, moderate, close? Hunting?
My pleasure in cast bullet rifle shooting comes from knocking down steel targets with modest loads, that are easy on me, my rifle, my targets, and my budget.
I am now regularly under 2 MOA out to 440 yards. The slower speed of .30 caliber cast is allowing me to experience some of the nuances of long range shooting on a closer scale. What I mean is, just like shooting .22 l.r. out to 300+ yards has force me to learn drop, windage, mirage, and technique, so has shooting cast in rifles. Currently I am stuck at 440 because that is all the range I have here. I view Waco's success of 2 MOA cast at 500 as a worthy goal and one I hope to attain.
We here on the forum can offer more information if we know what your goals are, and can save you a pile of money and frustration to boot.