Perhaps you'll be interesting in a bit of Keith lore, which I read many years before I started casting.
When Elmer 'designed' his 44 bullet, which is 'THE" Keith bullet, he studied to see which cast bullets won the most matches, and it was a 375 caliber flatnose made by Lyman and used in 38-55 rifles. So, he contacted Lyman and had them make that bullet with three drive bands to fit the 44. The 'true Keith bullet' when you measure the nose diameter right up close to the shoulder is .375 diameter or very close. Elmer got good extra good results, and in fact was my idol back then. He still is though he's dead for quite a few years. Guess I wish I could have been the man in his saddle during all those outfitting years!
The true keith bullets which I make are copies for bullets which personal friends of Keith sent to me with decent documentation that they were authentic. So the three authentic Keith bullets, I make as exact as I can. I make many SWC bullets based on the Keith nose profile but if they are not exact, I call them LBTK. These can be shortened noses, lengthened bodies, gas check, various lube grooves, any change the customer wants. It would perhaps be better if I simply called them SWC's but because the form is based on the true Keith profiles I chose that method of keeping the record clear. One example which seems to be very much liked is an exact copy of the 44 cut for 45 caliber, which comes out at about 270 grains. It COULD be called a Keith, but it isn't exact, because it is fatter with no other change, but that makes it an LBTK.
Veral at LBT