They (all) will actually hold a heavier charge of Swiss powder than GOEX, due to the tighter 'pouring' packing of the Swiss powder. I found this when testing light measures. The Swiss, due to it's finish and perhaps harder grains, packs MORE into a stricken charge.
IIRC, we used 50gr. 3F in Taylor's Walker, whereas the 1860 Army held only about 30gr.
Huvius, what charge does the .44 on the '51 Navy frame hold?