Having the primer or fulminate in the center of the base: opposed to rim-fire: used of cartridges. Also central-fire.
The Century Dictionary (Public Domain)
Use "center-fire" in a sentence
"All my center-fire rifles have hinged floorplates, and while I have heard stories about them giving way and dropping one's cartridges into the dirt or snow, it mercifully has never happened to me."
"Granting that one places his shot accurately, almost any center-fire rifle will kill a whitetail deer."
"I'd have to drive about 40 miles and pay about $500 for a club membership just to have a place to shoot a center-fire."