With the supply shortage of percussion caps, particularly #11's, I've switched over several longarms to Musket Caps. I found many Musket Caps in stock and for prices better than the percussion caps. I paid $7.49 per 100 (not including shipping) where #11's are listed as $9.70 per 100 when in stock. Two Tresco nipples were $16.88. I got some other stuff too which off-set the Haz-Mat fee. This is from a well-known, reputable muzzleloading company. I had a set of musket cap nipples so I put them on a Pedersoli shotgun. They work fine without any hammer modification. Since I have several and fire several hundred rounds each year I figured this was a way to make sure I am still up and running this hunting season and maybe next. I have one rifle that currently uses musket caps and two others that also can be switched with a nipple change. So - I guess my shotguns and rifles are .... muskets? Well, they're going to use the caps anyway.