I can make you a heavy 338 bullet with excellent ballistic coefficient, but no one can make an accurate bullet cast bullet which will duplicate the BC of the Serria Match King. This because bearing length is too short to support a lead bullet.
May I suggest that you get my 1 inch ogive spitzer bullet in the weight you want? Trajectory will be more arched and you'll have to load down from full jacketed velocity to get top accuracy, but you'll learn the trajectory quickly.
If you want to load to full throttle for the flattest possible trajectory, the LBT GOP design will do it for you. GOP means glue on patch. The paper is sprayed with diluted elmers glue, on one side, then wrapped on like a band aid around your finger. Or computer labels cut to size work well. The paper is then wetted with melted LBT bullet lubricant, by melting just enough in an aluminum cake pan, heating in a kitchen oven, along with bullets, to wet the paper. Bullets can be sized or shot un sized. Velocity will exceed any jacketed bullet of equal weight and the bore will NEVER foul, but will develop a polish that's hard to imagine after shooting them for a while.
Preparing GOP bullets takes about the same time as conventional paper patching, but far less skill, and cost is much lower than using gas checks. Very soft lead can be used, so it makes beautiful hunting bullets. Of coarse all rifle calibers can use GOP bullets.
