RE3llever:An interesting read, from the guntoters blog. Thanks for sharing. If memory serves, I've seen the work done by Mako(mentioned in guntoters), regarding percussion caps, on the Open Range forum. Plenty of in depth detail and well researched. Well worth a read, if you can find it.
One thing a c&b shooter soon realizes is that, one size does not fit all....when it comes to selecting percussion caps. So...attention needs to be paid, when selecting caps, as well as nipples. Prospective C&b shooters are fortunate, these days, that there is so much information like this, available on the internet.