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Heman, The firing pin in rimfire guns strikes the rim of the cartridge base to ignite a primer while in centerfire the firing pin strikes a center primer. Details are here : (https://www.pewpewtactical.com/rimfire-vs-centerfire-ammunition/) ---- Centerfire rimmed cartridges like revolver *38/357* sometimes called flanged cartridge, is the oldest of the types and has a rim that is significantly larger in diameter than the base of the cartridge. Rimmed cartridges use the rim to hold the cartridge in the chamber of the firearm, with the rim serving to hold the cartridge at the proper depth in the chamber—this function is called "head spacing". (This is why moon clips are required for rimless cartridges in a revolver like 45ACP.

Hi Heman, The firing pin in rimfire guns strikes the rim of the cartridge base to ignite a primer while in centerfire the firing pin strikes a center primer. Details are here : (pewpewtactical.com/rimfire-vs-centerfire-ammunition/) ---- Centerfire rimmed cartridges like revolver *38/357* sometimes called flanged cartridge, is the oldest of the types and has a rim that is significantly larger in diameter than the base of the cartridge. Rimmed cartridges use the rim to hold the cartridge in the chamber of the firearm, with the rim serving to hold the cartridge at the proper depth in the chamber—this function is called "head spacing". (This is why moon clips are required for rimless cartridges in a revolver like 45ACP.