bill- Swiss is considerably more expensive, but you get what you paid for, in terms of an almost duplicate in speed and pressure to original loads. GOEX runs about 20% behind Swiss - that is, it takes about 20% more GOEX to match the ballistics of Swiss.
: In the cannon you're having build, I'd just use GOEX. To me, Swiss is for regulating a favourite BP double express rifle or for competition with BP Ctg. guns, not for making smoke. I seem to be able to hit the winner's circle often enough using GOEX in my flinter so don't feel comprimized using the cheaper 'stuff'. For use in my Sharps though, I'd sure like to glean a few pounds of Swiss.