You could use a couple of budget 5C spindex fixtures, one to index, one as a cheap tailstock (they're $38 at enco). Turn a 10 degree taper at the nose end to fit the 5C and drill and tap a drawscrew hole where the "muzzle" is going to be later. Use table offset to get the lug angle then index a degree at a time, leave a couple thou at the root diameter to clean up with hand filing.
You'd be boring out the threaded hole later and turning the nose profile to get rid of the 5C taper. Throw away tooling
Tiger