Uh, well, no not really....but they don' really have much application in CAS.
Why, for shame on your Monsieur Crooked - there are many who aspire to use large bore ML in Bufallo matches, some of which use the muskets caps! I personally use a musket nipple for my .1863 Sharps to introduce as much fire into that painfully circuitous and meandering fire channel as possible.
However Monsieur Scrounger, some several years ago I haunted the local WallyWorlds during end of hunting clearance sales and acquired a good 8 or 10 tins of standard musket caps at an obscenely low price , so it is not likely I will be trying the new ones...
yhs
prof marvel