Lee two cavity mold. 19 bucks, Lee push through sizing die, 20 dollars, if Mold is for tumble lube boolits, sizing die can be omitted.
Advantages of casting , can shoot much more cheaper. So long as chamber size allows, an oversized bore is no problem. Cast boolits over time have come a long way. Still read and hear the old horror stories of leading, inaccurate, no good for CF rifles, can’t push them at high velocities, etc, etc, etc ad nauseam, and all pure BS.
IMO, undersized boolits are the biggest culprit when it comes to leading. If the high pressure gas can get past the boolit, the cutting action will almost guarantee leading. Hard or soft alloy, I always go for at least .002" over slugged bore size. if the round chambers without pushing boolit down into case or can be extracted without boolit sticking in bore and pulling out when ejected, they are good to go for me.
Quick check for me as to largest diameter boolit can be used, measure inside diameter of neck on a few fired cases, that determines it.
Some milsurp and sporting rifles will have tight chambers and oversized bores, for such a rifle, I would not even attempt shooting cast boolits. Impact slugging or making a cast of the chamber and throat and slugging the bore are two of the most important things to be checked for accurate cast boolit shooting. These two factors will determine boolit seating depth and sizing of boolit diameter.