Recreational shooting clearly.

The guns the biathletes use in the Winter Olympics aren’t “meant to kill”.

They may not be meant to kill, but they are clearly designed to kill.

They have the same essential design as most low-caliber rifles that are explicitly designed for hunting - i.e., designed for killing.

That design came from centuries of seeking more efficient, efficacious ways to kill with guns.

Sure, they're tweaked to be optimal for very formalized, competitive shooting, not military combat, but they'd still serve very well for executions, sniping, and the like.

See also biathlon's roots in military training: https://en.m.wikipedia.org/wiki/Biathlon#History