Cool Wayne - but that round ball is not going very fast. With such a slow powder, you should be able to develop some good ballistics - time will tell.
: Say - with Hodgdon powders made in your Country, how about 'Longshot', shotgun powder? Perhaps that is what you are using? It's shotshell published data here shows 1 3/8 Oz. shot doing well over 1,500fps. That being the case, you should be able to easily match that with round balls. They will make a truely a great load.