Cool mould and good idea for the ejector pin - the spring would soon lose it's spring if on one of my moulds - but excellent idea.

Afro - is your bullet tapered, front to back or does it have a parallel side? It is a good looking bullet.

Since this is for the Martini - (I think) the bullet weight would be fine. Kinda like me shooting 405gr. to 525gr. in my .45/60 Sharps when that particular Winchester round originally used 250gr. or lighter bullets.