I've never had any significant ignition issues with my Pedersoli 3-band P53 Enfield, (using either CCI or Scheutzen 4-wing caps) but my new (and beautiful!!) Pedersoli Zouave is a different story -- LOTS of ignition problems with that one, regardless of cap brand. Scheutzen caps fit much tighter on the nipple and seem to take one hammer strike to seat them fully, then BANG on the second strike. The CCI caps are easier to seat on the cone and generally fire first strike, but often fail to ignite the charge. On close examination it looks like my hammer face is hitting the cone a bit off-center -- not hitting the musket caps squarely over their whole circumference. I'm sure this contributes to my ignition difficulties with the Zouave, and I have NO idea how to fix that. Torch and gently bend the hammer arm until the face hits the caps/cone squarely?? Hmmm . . . not sure I want to risk that.
On the bright side, the Zouave is a wonderful shooter -- when it fires reliably.
While I do like Schutzen caps, they are gilded steel and as such, don't seat easily on some nipple profiles resulting in misfires with the first hammer strike. Easy way to deal with it, chuck the nipple in a drill and turn it at slow speed dressing it with a small file and polish removing just a touch of material on the outside of the nipple. Check often with a cap to see if you've removed just enough to allow the cap to seat properly. Problem solved.