Swiss has a greater density (heavier per volume) than the other makes of black powders. It is also slightly more energetic.
17.06gr. actually. Interesting. I don't think the load and wads would come up to the bottom of the ball, of course, much would depend on the thickness of the wads.
Concerned over ringing the chamber, is all. Of course, more or thicker wads could be used.
.375 is a normal mould sold by all mould makers here as that size is meant for the .36 cap and ball revolvers.