| 6×45mm |
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| Type | Rifle, Handgun |
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| Place of origin | United States |
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|
| Designed | 1965 |
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|
| Parent case | .223 Remington |
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| Case type | Rimless, bottleneck |
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| Bullet diameter | 0.243 (6.2 mm) |
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| Neck diameter | 0.272 in (6.9 mm) |
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| Shoulder diameter | 0.354 in (9.0 mm) |
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| Base diameter | 0.377 in (9.6 mm) |
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| Rim diameter | 0.378 in (9.6 mm) |
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| Rim thickness | 0.045 in (1.1 mm) |
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| Case length | 1.76 in (45 mm) |
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| Case capacity | 26.9 gr H2O (1.74 cm3) |
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| Primer type | Small rifle |
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|
|
|
| Bullet mass/type |
Velocity |
Energy |
| 70 gr (5 g) SP |
3,000 ft/s (910 m/s) |
1,400 ft⋅lbf (1,900 J) |
| 80 gr (5 g) SP |
2,900 ft/s (880 m/s) |
1,495 ft⋅lbf (2,027 J) |
| 90 gr (6 g) SP |
2,800 ft/s (850 m/s) |
1,565 ft⋅lbf (2,122 J) |
| 100 gr (6 g) SP |
2,650 ft/s (810 m/s) |
1,560 ft⋅lbf (2,120 J) |
|
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.