I have to ask... why not just make a simple conical of length = ball diameter with a belt on it to ensure aligned loading? The belt will shear off as the boolit seats.
Belted Ball.pdf
A lube groove could be added if you want and if you want more weight length can be as long as the rammer will allow.
If you wanted a flat nose then RNFP but either way the nose would fit the rammer as is.
Just curious.
Longbow