Why musket caps? Reliability enhancement Are the noses of the hammers large enough for musket caps? Yes Do they strike centre close enough to clear the sides of the 'cup', is the proper question, I guess. Yes
As to reliability - I've never had a miss-fire with normal #11's - that is, when there was powder in the barrel. I just don't see the need for musket caps. Perhaps they are very much cheaper in the States than here. The last price I saw here was $9.95 for 100.