"creed" isn't the name of a cartridge.

Merriam Webster:
Definition of creed
1
: a brief authoritative formula of religious belief the Nicene Creed
2
: a set of fundamental beliefs; also : a guiding principle
Never settle for mediocrity is his creed. — Jill Lieber
creedal or credal play \ˈkrē-dəl\ adjective