YMMV and MMMV. I think there is a wide variation in the degree of taper of different makes of revolver nipples at different times. Half of my guns take CCI#11s, the other half take RWS#1075s but all 15 will take Rem#10s. If a gun doesn't fit Rem#10s I replace the nipples with ones that will (Uncle Mike's/Butler Creek or TOW SS nipples). I actually haven't installed any Slix-shot nipples yet even though the designers hound me every time I have a misfire. Of the 37 C&Bs I've owned over the years I've managed to get Rem#10s to fit them all one way or another. My mileage continues to vary.
With over 15 perCUSSIN' revolvers, I've been called the Imelda Marcos of cap & ball.
SASS#3302 (Life), SASS Regulator, NRA (Life), DGB#129
Wolverton Mtn. Peacekeepers (WA), former Orygun Cowboy (Ranger, Posse from Hell)