Great Bottleneck Cartridges from Ammunition Depot Bottleneck cartridges aren’t exactly rare. In fact, the bulk of modern rifle cartridges are bottlenecked. The advent of modern ballistics has determined that the penetration and performance of a bullet is more important than its size. This means that firing a marginally smaller projectile with more propellant is generally more effective for hunting or defense than a larger, slower round.
As such, an effective way to throw a smaller projectile farther, faster, and harder than would otherwise be possible is by necking a cartridge down. While everyone who’s in the know is aware that Ammunition Depot is the best place to get bulk 9mm ammo, it’s also the top source for some of the best bottleneck ammo on the market. The focus here is bottleneck cartridges that are used in both pistols and rifles. .223 Remington/5.56 NATO: AR-15 The .223 Remington/5.56 NATO cartridge is the most popular rifle cartridge on the market. It is the caliber (5.56 NATO) favored by most of the Western world’s military for decades now. Its popularity is based on its effectiveness and flat, straight trajectory. Obviously .223 5.56 ammo is the foundational cartridge for millions of carbines around the world but it is also used in AR15-style tactical pistols. 5.57x28mm: FN Five-seveN The 5.57x28 bottleneck cartridge was developed by the legendary weapons manufacturer FN Herstal in response to a request from NATO to develop an alternative to the 9mm Parabellum. The request included a caveat that the bullet is capable of defeating armor-piercing. The resulting 5.57x28mm cartridge, chambered for the FN Five-seveN pistol and FN P90 personal defense weapon delivered. Civilian versions of the cartridges (that don’t defeat body armor) are available from Ammunition Depot, as is the FN Five-seveN.