When I am shooting real BP in my .50 percussion Renegades, I use (and and have had no problems with) the standard T/C nipples. A long time ago, when I could only get Pyrodex, I was forced to use Hot Shot nipples.
Larry
kinda like the 'hotshot' nipples, they have two small vent holes on the side of the nipple that 'blows' the cap loose on firing. no more trying to dig a fired cap off the nipple. they just fall off.
I went to using Hot Shot nipples way back.....I don't even remember when. Never have used anything else. Why fix it if it ain't broke. Uncle Mike makes a good nipple. Hot shot!!!