I have been skirmishing since 1967 and shooting RWS caps in my various CW rifles since. I can tell you that the priming in the RWS winged caps and the wingless is the same. I spoke with an RWS sales rep about that many years ago. I use the wingless for practice because until recently they were 10-15 dollars cheaper/1000 than the top hats and would give the same firing results as the winged. Winged caps now are the descendants of the military winged caps designed so that a soldier could pick a cap out of his capbox by touch and orient it to slip on to the nipple of his weapon in the dark of night or heat of battle without looking. He could load that way too. I believe the CCI are hotter because when I took the breechblock out of my Sharps percussion repro and capped the nipple, set it off by tapping with a small hammer and observed the fire in my dark garage the CCI flash length was longer and the size bigger. Some guns shoot better with a hotter cap. The wingless cap was a sporting use cap, though nearly 100% interchangeable with the top hat. I'm not a reenactor, but have attempted to help reenactors without live fire experience to learn to shoot a minie ball. Of the 6 I have experience with as a group, 2 had guns so neglected as to be unsafe with breeches nearly completely clogged and bores severely pitted from rust. All but one of the rest had guns with moderately pitted bores, but a cap could still fire through the flash channel. We shot moderate 40 grain charges and lighter than standard minies. One fellow had drilled out the nipple for fire to pass to blank charges and didn't tell. After concealing hammer blowback on the first shot, his second shot blew the hammer back, which broke the tumbler, releasing the repro extra heavy mainspring, allowing it to tear out a chunk of wood under the lockplate neat the triggerguard. No injury resulted But the entire experience left me with little regard for....... But that's another matter. Hope this helps a bit about musket caps. Wonky