| .17-223 | |
| Origin: | United States |
| Type: | Rifle |
| Parent: | .223 Remington |
| Case Type: | Rimless, bottleneck |
| Bullet: | .172 |
| Neck: | .203 |
| Shoulder: | .358 |
| Base: | .376 |
| Rim Dia: | .378 |
| Case Length: | 1.76 |
| Length: | 2.15 |
| Primer: | Small rifle |
| Bw1: | 25 |
| Btype1: | Hornady |
| Vel1: | 3929 |
| En1: | 875 |
| Bw2: | 25 |
| Btype2: | Hornady |
| Vel2: | 3940 |
| En2: | 862 |
| Bw3: | 25 |
| Btype3: | Hornady |
| Vel3: | 3989 |
| En3: | 883 |
| Balsrc: | Ammo Guide [1] |
The .17-223 is a centerfire wildcat rifle cartridge. It is based on the .223 Remington, but the neck is re-sized to accept a .17 caliber bullet.