The Rem #10s and #11s are the same DIAMETER but the #11s are shorter in order to grip fatter cones (larger nipples). A smaller nipple will get gripped farther down the shank with the longer #10 and thus is considered a "smaller" cap.
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)