7.5 FK
The 7.5 FK is a proprietary cartridge[1] designed in 2011 by FK BRNO.
| 7.5 FK | ||||||||
|---|---|---|---|---|---|---|---|---|
| Type | Pistol | |||||||
| Place of origin | Czech Republic | |||||||
| Production history | ||||||||
| Designer | FK BRNO | |||||||
| Designed | 2011 | |||||||
| Specifications | ||||||||
| Case type | Rimless, bottleneck | |||||||
| Bullet diameter | 7.8 mm (0.307 in) | |||||||
| Neck diameter | 8.5 mm (0.335 in) | |||||||
| Shoulder diameter | 10.8 mm (0.425 in) | |||||||
| Base diameter | 10.8 mm (0.425 in) | |||||||
| Case length | 27 mm (1.063 in) | |||||||
| Overall length | 35 mm (1.378 in) | |||||||
| Ballistic performance | ||||||||
| ||||||||
| Test barrel length: 152 mm | ||||||||
Development
The cartridge was created to be used with the FK BRNO Field Pistol, and later with by the FK BRNO PSD Pistol.
Although the basic case design and the concept of the cartridge was finalized in 2011, more than 250,000 rounds were fired with at least 15 different case design variations and over 30 different bullet designs were tested over a four-year period before the final cartridge design form was approved for production.
Other Interests, necked down 9 and 10mm’s
Interest in the older 7.62x25 Tokarev has gained support recently and has quite a following in the US. The 7.62x25 is basically a 9mm style case necked down to a 30 caliber bullet. Hope for a new or improved 7.62x25 round was wanted by many shooters. Our wish may have been granted by the new 7.5 Fk, also a 30 Caliber round, but using the larger 10mm style case, pushing that 30 caliber bullet much faster.
Popular Necked down rounds in the US (large caliber to small).
- 357 Sig, basically a 10mm necked down to a 9mm/38 Caliber bullet.
- 9×25mm Dillon, basically a 10mm necked down to a 9mm/38 Caliber bullet.
- 7.5 FK, basically a 10mm necked down to a 30 Caliber bullet.
- 7.62x25, basically a 9mm necked down to a 30 Caliber bullet.
- 22 TCM, basically a 9mm necked down to a 22 Caliber bullet.