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.6X45mm Ammo

.6X45mm Ammo For Sale From Various AMmo Retailers

The 6×45mm is a rimless, bottlenecked cartridge based on the .223 Remington or 5.56 NATO cartridge necked up to .243 (6mm). The cartridge is also known as the 6mm-223 Remington or 6mm/223.

The cartridge is exceptionally efficient with its small powder charge. This translates to excellent barrel life. The cartridge has a very low recoil and muzzle blast, which makes it a pleasant cartridge to shoot.

The 6×45 mm ammo is a wildcat cartridge and has not been standardized by any agency, nor has it been offered a proprietary cartridge by any ammunition manufacturer. Some specialty rifle makers, such as those that sell varmint rifles, offer rifles chambered in this cartridge. Specifications for the cartridge are derived from the necked up parent cartridge without further improvement.

About: 6x45mm

  • Type: Rifle, Handgun
  • Place of origin: United States
  • Designed: 1965


  • Parent case: .223 Remington
  • Case type: Rimless, bottleneck
  • Bullet diameter: 0.243 (6.2 mm)
  • Neck diameter: 0.272 in (6.9 mm)
  • Shoulder diameter: 0.354 in (9.0 mm)
  • Base diameter: 0.377 in (9.6 mm)
  • Rim diameter: 0.378 in (9.6 mm)
  • Rim thickness: 0.045 in (1.1 mm)
  • Case length: 1.76 in (45 mm)
  • Case capacity: 26.9 gr H2O (1.74 cm3)
  • Primer type: Small rifle

Ballistic performance

Bullet mass/type Velocity Energy
75 gr (5 g) SP 2,700 ft/s (820 m/s) 1,214 ft⋅lbf (1,646 J)
80 gr (5 g) SP 2,650 ft/s (810 m/s) 1,248 ft⋅lbf (1,692 J)
90 gr (6 g) SP 2,540 ft/s (770 m/s) 1,300 ft⋅lbf (1,800 J)
100 gr (6 g) SP 2,400 ft/s (730 m/s) 1,279 ft⋅lbf (1,734 J)

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