Cast bullet 50 Alaskan; high BC to be used for long range at subsonic velocity?

[d375land]

Maybe what I am looking for is a ghost but, I would like to find or make something on the order of the 650-750
grain BMG bullet.  The jacketed slugs are a trifle expensive and I would like something along the line of the Barns 800 gr but, I wish tocast it.  Am I barking up a tree or is there something out there?

[Veral]

  Your post title says you want to shoot them subsonic, which means a streamlined bullet is somewhat of a moot point.  But I can make you a one inch radius spitzer with a maximum weight of about 650 gr as I recall.
  If you want to use it for game, you'd do better with the LFN which I can get 700 grains with in my mold blocks.  What I'm saying here is, my mold block size is fixed and puts a limit on bullet length.

[d375land]

Thanks for the offer but, I have a Hoch mold for a 685 gr nose pour at the present and will probably have to
take a stab at making my own mold.