[Elenya]

Silent Scope is a very popular video game

Is it a game for single shot kills?

[spokeshave]

Could be using a larger caliber with a sabot style .223.

This would give a much greater muzzle velocity, accuracy and range.

The found .223 cartridge could be a red herring

[Shooter 2.5]

Single shot kills with multiple targets. I did see a scenario where the bad guy had a hostage and the player had to kill the bad guy with a head shot. There is also a scenario with a running hostage taker. It's popular enough where you can find it at any arcade.

[js1138]

Could this be a game of M.O.O.S.E.?