Have been away from cast bullet shooting for about 30 years. I decided the other day I would like to design a mold for my No.4 MkII Lee-Enfield. I have been reading a lot about the Greenhill formula and the length of projectile a given twist can stabilize. Before I cause brain damage to myself, is there a simple way to determine the radius of the ogive of the bullet? I know some of the real nice jacketed designs have a radius of maybe 7 to 9 diameters. I also have a 308413 that has a really nice flowing radius.Thanks,.................Ray