Oh, yes, caps do need instructions. You need the following instruction to use caps efficiently.
You need to know the size of the cone on your nipple.
You need to know the proper size of the cap to use.
You need to know how to set the cap on the cone of a nipple.
You need to know how to maintain the cone of a nipple, so the caps fit properly.
You need to know how to keep the flash channel clear so the heat of the cap's ignition can reach the powder charge.
Then of course, there is getting a tiny cap from the tin to the cone. Filling one of those inline cappers is chore that I don't enjoy. That's why I have a Cash oval capper for my rifles.
You need to know the size of the cone on your nipple.
You need to know the proper size of the cap to use.
You need to know how to set the cap on the cone of a nipple.
You need to know how to maintain the cone of a nipple, so the caps fit properly.
You need to know how to keep the flash channel clear so the heat of the cap's ignition can reach the powder charge.
Then of course, there is getting a tiny cap from the tin to the cone. Filling one of those inline cappers is chore that I don't enjoy. That's why I have a Cash oval capper for my rifles.