The good bullet mould makers will make a mould in any size you desire. Good moulds, really good ones, are one of the great benefits of modern technology.

Your mould looks to be a pistol mould with a very short base, and perhaps a longer nose. Sort of odd it seems. As I understand what you are saying, the shoulder at the ogive is not so terribly uncommon. They are essentially semiwad cutters that make wonderful target bullets for short range. They also do a fairly good job of scraping away powder fouling from a previous shot rather than running over it and deforming the bullet. I have one that I had Buffalo Arms make for shooting paper patched bullets in a .45-70 lever gun.

Here is another sort of similar bullet.
https://www.buffaloarms.com/455-250-grn-...50rnhb-rcb57919

_________
BrentD, (Professor - just for Stan)

[Linked Image from i.imgur.com]