Canadian Firearms Safety Course (CFSC) Practice Exam

A rim fire cartridge is indeed a type of modern ammunition. This design uses the rim of the cartridge case to hold the primer, allowing for ignition when struck by the firing pin of a firearm. Rim fire cartridges are particularly notable in smaller caliber firearms, such as the .22 caliber, and are widely used today in target shooting, small game hunting, and even some types of competitive shooting.

In contrast, the other options are specific components or types of ammunition that, while they may be used in modern firearms, do not represent a complete modern cartridge system. Steel shot refers to the material of the shot used in shotgun shells, often in the context of waterfowl hunting, where lead shot is restricted. Lead pellets are similar in that they indicate the material used for shot but do not describe a specific cartridge. Solid projectiles pertain to a category of bullets without additional components like hollow points or frangible designs, but this term also lacks completeness to classify as modern ammunition on its own without context regarding the cartridge system it’s part of. Thus, the rim fire cartridge stands out as the most definitive type of modern ammunition listed.