If the pellets have black powder on one end then yes, you have pyrodex pellets. Triple Seven pellets do not have black powder on them.

You want to put the black powder end in first so they can get the most fire from the caps, thats why they were made like that. Pyrodex is harder to ignite than T7.

If you have experience with loose powder I would recommend staying with it. Pellets won't give you as many options when developing a load for your rifle/pistol.