Daryl: I'm only guessing and really don't know what they will send. I too am aware of the Dutch "fowler" conversions and hope that it is more of a weighty rifle configuration. They pounded Selous to pieces... yet the Boers hunted with 4 bores a lot... and seemed to do quite well with them. I'm in way over my head on this one because the biggest thing I've ever had in my hands is a .72 and can't imagine what it will be like to shoot such a brute. I've hunted a lot with big custom .58's that handled powder charges up to 150 grains very well but this is a completely different galaxy. Since the plan is to market it in RSA for hunters I imagine it will be a pretty solid rifle and probably heavier than the fowlers. And I'm only guessing on the loads from reading. Gregor Woods has some pretty good discussions on the 4 bore in his book "Rifles for Africa." Needless to say I've poured through it and reread Selous' first book. When I know more I'll share cause with South Africa's new gun regs, a historically correct pre-1890 muzzleloader is subject to no restrictrions and I've always felt that on bush game preserves a muzzleloader is a very credible way to enjoy a top knotch hunting experience.