# 12 mm caliber

This is a list of firearm cartridges which have bullets in the 12 millimetres (0.47 in) to 12.99 millimetres (0.511 in) caliber range.
* Length refers to the cartridge case length.
* OAL refers to the overall length of the cartridge.
* Bullet refers to the diameter of the bullet.
Some measurements are in millimetres, while others are measured in inches.

## Pistol cartridges

| Name | Bullet | Case type | Case length | Rim | Base | Shoulder | Neck | OAL |
| .475 Wildey Magnum | 12.1 (.475) | Rebated straight walled | 30.4 (1.198) | 12.0 (.473) | 12.7 (.501) | - | 12.50 (.493) | 40.00 (1.575) |
| .50 Action Express | 12.7 (.500) | Rebated straight walled | 32.64 (1.285) | 13.06 (.514) | 13.89 (.547) | - | 13.72 (.540) | 40.89 (1.610) |
| .50 GI | 12.7 (.500) | Rebated straight walled | 22.81 (.899) | 12.19 (.480) | 13.36 (.526) | - | 13.36 (.526) | 31.01 (1.221) |

## Revolver cartridges

| Name | Bullet | Case length | Rim | Base | Shoulder | Neck | OAL |
| .480 Ruger | 12.065 (.475) | 32.639 (1.285) | 13.767 (.542) | 12.802 (.504) | - | 12.802 (.504) | 41.91 (1.650) |
| .475 Linebaugh | 12.08 (.476) | 35.16 (1.384) | 13.77 (.542) | 12.80 (.504) | - | 12.80 (.504) | 44.43 (1.749) |
| .500 S&W Special | 12.7 (.500) | 32.4 (1.274) | 14.12 (.556) | 13.36 (.526) | - | 13.36 (.526) | 44 (1.733) |
| .500 Wyoming Express | 12.7 (.500) | 35 (1.37) | 13.8 (.543) | 13.7 (.541) | - | - | 44.8 (1.765) |
| .500 Linebaugh | 12.95 (.510) | 35.69 (1.405) | 15.49 (.610) | 14.05 (.553) | - | 13.72 (.540) | 44.58 (1.755) |
| .500 S&W Magnum | 12.7 (.500) | 41.275 (1.625) | 14.12 (.556) | 13.36 (.526) | - | 13.36 (.526) | 53.34 (2.10) |
| .500 Bushwhacker | 12.7 (.500) | 62 (2.45) | 14.12 (.556) | 13.36 (.526) | - | 13.36 (.526) | 75 (2.95) |

## Rifle cartridges

| Name | Bullet | Case type | Case length | Rim | Base | Shoulder | Neck | OAL | Primer |
| .475 A&M Magnum | 12.07 (.475) | Belted, bottleneck | 73.66 (2.90) | 13.54 (.533) | 14.83 (.584) | 14.22 (.560) | 12.75 (.502) | 95.25 (3.75) | Boxer large rifle |
| .470 Capstick | 12.07 (.475) | - | 72.39 (2.85) | 13.51 (.532) | 13.03 (.513) | - | 12.67 (.499) | 92.71 (3.65) | - |
| .476 Nitro Express | 12.09 (.476) | Rimmed, bottleneck | 76.2 (3.00) | 16.33 (.643) | 14.48 (.570) | 13.46 (.530) | 12.9 (.508) | 95.76 (3.77) | Berdan 6.45 (0.254) |
| .470 Nitro Express | 12.27 (.483) | Rimmed, bottleneck | 88.65 (3.25) | 16.41 (.646) | 14.53 (.572) | 13.41 (.528) | 12.7 (.500) | 108.2 (4.26) | Berdan 6.45 (0.254) |
| .475 No. 2 Nitro Express | 12.27 (.483) | Rimmed, bottleneck | 82.55 (3.49) | 16.86 (.665) | 14.63 (.576) | 13.89 (.547) | 12.95 (.510) | 98.04 (3.86) | Berdan 6.45 (0.254) |
| .475 Nitro Express | 12.27 (.483) | Rimmed, straight | 82.55 (3.25) | 16.41 (.646) | 14.53 (.572) | - | 13.41 (.528) | 98.04 (3.86) | Berdan 6.38 (0.251) |
| .577/.500 Magnum Nitro Express | 12.7 (.500) | Rimmed, bottleneck | 80 (3.13) | 18.2 (.717) | 16.4 (.645) | 14.9 (.585) | 13.4 (.526) | 95 (3.74) | Berdan 6.38 (0.251) |
| .50 Beowulf | 12.7 (.500) | Rebated-rim, straight | 42 (1.65) | 11.3 (.445) | 13.6 (.535) | - | 13.3 (.525) | 54 (2.125) | Boxer |
| .50 Alaskan | 12.95 (.510) | Rimmed, straight | 53 (2.10) | 15.5 (.610) | 14 (.553) | - | 13.6 (.536) | 53 (2.10) |
| .500 Auto Max | 12.7 (.500) | Rimless, straight | 14.12 (.556) | 13.36 (.526) | - | 13.36 (.526) | 53.34 (2.10) |
| .505 Gibbs | 12.8 (.505) | Rimless, bottleneck | 80.0 (3.150) | - | 16.3 (.640) | 16.3 (.640) | 13.7 (.538) | 97.8 (3.850) | |
| .500 No. 2 Express (.577/500) | 12.88 (.507) | Rimmed, bottleneck | 71.37 (2.81) | 18.44 (.726) | 16.28 (.641) | 14.22 (.560) | 13.67 (.538) | 86.36 (3.40) | Berdan 6.38 (0.251) |
| .500 Jeffery | 12.95 (.510) | Rebated-rim, bottleneck | 70 (2.75) | 14.6 (.575) | 15.7 (.619) | 15.4 (.607) | 13.7 (.538) | 87.88 (3.46) | |
| .50 BMG (12.7×99mm NATO) | 12.95 (.510) | - | 99.31 (3.91) | 20.42 (.804) | 20.42 (.804) | 18.82 (.741) | 14.22 (.560) | 138.43 (5.45) | Boxer |
| .510 DTC Europ (.50 DTC) | 12.95 (.510) | - | 96.77 (3.81) | - | - | 19.304 (.760) | - | 135.89 (5.35) | Boxer |
| .510 Whisper | 12.95 (.510) | - | 47.63 (1.875) | 14.94 (.588) | 14.91 (.587) | 14.91 (.587) | 13.94 (.549) | 84.84 (3.34) | Boxer |
| 12.7×108mm | 12.98 (.511) | - | 108 (4.3) | 21.70 (0.854) | 21.75 (0.856) | 18.90 (0.744) | 13.95 (0.549) | 147.50 (5.807) | - |
| 12.7×55mm STs-130 | 13.01 (.512) | - | 54.91 (2.16) | - | 14.86 (0.585) | - | 13.76 (0.54) | 94 (3.7) | - |
| 12.7x81mmSR (.50 British) | 13.1 (.516) | - | 81.2 (3.20) | 19.6 (.772) | 18.35 (.722) | 16.3 (.642) | 13.8 (.543) | 108.7 (4.28) | - |
Note: The .50 Sharps, Winchester, and US Government cartridges are actually of 13 mm caliber