Editing Caliber (section)

==Metric and US customary==
{{see|Metrication in the United States#Firearms}}
The following table lists some of the commonly used calibers where both metric and US customary units are used as equivalents. Due to variations in naming conventions, and the whims of the cartridge manufacturers, bullet diameters can vary widely from the diameter implied by the name. For example, a difference of 0.045&nbsp;in (1.15&nbsp;mm) occurs between the smallest and largest of the several cartridges designated as ".38 caliber".  <!-- And it may be noted that 0.38 inch is more than 9 {{Frac|1|2}}&nbsp;mm. -->
{| class="wikitable sortable" border="1"
|+ Common calibers in inch and their metric equivalents<ref name="accurate">{{cite book | last = Accurate  | title = Accurate Smokeless Powders Loading Guide | edition = Number Two (Revised)  | year = 2000 | publisher =Wolfe Publishing | location =Prescott, AZ | page = 392 | id =  barcode 94794 00200}}</ref><ref>{{cite web |url=http://www.blue-star-inc.com/catalog/lprbullet.htm |title=Pistol and Rifle Lead Bullets |access-date=2007-12-05 |archive-date=2020-10-05 |archive-url=https://web.archive.org/web/20201005090622/http://www.blue-star-inc.com/catalog/lprbullet.htm |url-status=dead }}</ref><ref>{{cite web |url=http://www.blue-star-inc.com/catalog/lprbullet.htm |title=Rifle Bullets |access-date=2007-12-05 |archive-date=2020-10-05 |archive-url=https://web.archive.org/web/20201005090622/http://www.blue-star-inc.com/catalog/lprbullet.htm |url-status=dead }}</ref><ref>{{cite web |url=http://www.rainierballistics.com/mainframe.htm |title=LeadSafe Total Copper Jacket ("TCJ") Bullet List |access-date=2007-12-05 |archive-url=https://web.archive.org/web/19990218162127/http://www.rainierballistics.com/mainframe.htm# |archive-date=1999-02-18 |url-status=dead }}</ref><ref>{{cite book|last1=Frank C Barnes|title=Cartridges of the World|publisher=Gun Digest Books|edition=14th}}</ref>
|-
! Caliber !! Metric caliber !! Typical bullet diameter!! class="unsortable"| Common cartridges !! class="unsortable"| Notes
|-
| 0.172 || [[4 mm caliber|4 mm]] || 0.172 in || [[.17 HMR|17 HMR]], 17 Hornet, 17 Ackley Hornet, 17 Winchester Super Magnum, 17-32 Magnum, 17 VHA, 17 Remington, 17/222, 17 Mach III-IV, 17 Ackley Improved Bee, 17-357 RG, 17 Remington Fireball, 17 Incinerator, 4.39×39R mm SPS ||
|-
| 0.204 || [[5 mm caliber|5 mm]] || 0.204 in  ||  [[.204 Ruger|204 Ruger]], [[5mm Remington Rimfire Magnum]] ||
|-
| 0.221 || 5.45&nbsp;mm || 0.221 in || [[5.45×39mm]] Russian family || Russian Mil Std 
|-
| 0.223 ||[[5.56 mm caliber|5.56 mm]]||0.224 in||[[22 Long Rifle]], [[.223 Remington]],  [[5.56 NATO  ]], 297/230 Morris Extra Long, [[.22 Hornet|22 Hornet]], [[22 Rem Automatic]], [[5.66 x39 MPS]], [[22 Rem Jet]]||
|-
| 0.224 || 5.7&nbsp;mm || 0.224 in|| [[.218 Bee|218 Bee]], [[.219 Zipper|219 Zipper]], 22 Hornet-K, [[.220 Swift|220 Swift]], [[.222 Remington|222 Remington]], [[.222 Remington Magnum|222 Remington Magnum]], [[.223 Remington|223 Remington]], [[5.56×45mm NATO|5.56×45 mm NATO]],  [[5.7×28mm|5.7×28 mm]], [[.22 TCM]], [[5.8×42mm DBP87|5.8 × 42 Chinese]], [[.224 Weatherby Magnum|224 Weatherby Magnum]], [[.225 Winchester|225 Winchester]], [[.223 Winchester Super Short Magnum|223 Winchester Super Short Magnum (Obsolete)]] 223 Ackley Improved, [[.219 Donaldson Wasp|219 Donaldson Wasp]], [[.221 Remington Fireball|221 Remington Fireball]], [[.22-250 Remington|22-250 Remington]], and more ||
|- || 
| 0.243 || [[6 mm caliber|6 mm]] || 0.243 in || [[.243 Winchester|243 Winchester]], [[6mm Remington|244 Remington]], [[6mm Remington|6 mm Remington]], 6&nbsp;mm Whisper, [[6mm PPC|6 mm PPC]], [[6mm BR|6 mm Bench Rest Remington]], [[6×45mm|6 × 45 mm]], [[6.5×47mm Lapua#Variants|6 × 47 mm]], 6&nbsp;mm Cheetah, 240 Weatherby, 6 × 62 Freres, [[6mm BR|6 mm Norma BR]], [[6 mm XC|6mm XC Tubb]], 6&nbsp;mm JDJ, 6&nbsp;mm SAW, 6-250 Walker, 6.17 Spitfire, 6.17 Flash, 6&nbsp;mm Lee Navy, and more ||
|-
| 0.25 || 6.35&nbsp;mm ||0.257 in, 6.35&nbsp;mm ||[[.25 ACP|25 ACP]] (0.251"), [[.250-3000 Savage|250/3000 Savage]], [[257 Roberts]], [[.25-06|25-06]] (0.257"),|| also called .25 Auto and 6.35mm Browning
|-
| 0.26 || 6.5&nbsp;mm || 0.264 in, 6.7&nbsp;mm  ||  [[6.5×55mm Swedish|6.5 × 55 mm Swedish]], [[.260 Remington|260 Remington]], [[.26 Nosler|26 Nosler]], [[6.5mm Creedmoor|6.5 mm Creedmoor]], [[6.5×47mm Lapua|6.5×47 mm Lapua]], [[6.5mm Grendel|6.5 mm Grendel]] || cartridges commonly known as "6.5&nbsp;mm"
|-
| 0.27 || 6.8&nbsp;mm || 0.277 in, 7.035&nbsp;mm  ||  [[.270 Winchester|270 Winchester]], [[6.8 SPC]], [[.277 Fury]]||
|-
| 0.284 || [[7 mm caliber|7 mm]] || 0.284 in, 7.213&nbsp;mm  ||  [[.280 Remington|280 Remington]], [[7mm-08 Remington|7 mm-08 Remington]], [[7mm Weatherby Magnum|7 mm Weatherby Magnum]],  [[7mm Remington Magnum|7 mm Remington Magnum]], [[7×57mm Mauser|7 × 57 mm Mauser]], [[7×64mm|7 × 64 mm]] || commonly called "7&nbsp;mm"
|-
| 0.308 || 7.62&nbsp;mm || 0.308 in, 7.82&nbsp;mm || 30 Luger (7.65×21mm Luger), [[.30-30 Winchester]], 30 Herrett, 300 Whisper, 30-378 Weatherby, 7.63 Mannlicher–Schoenauer, 7.63 Mauser, 30 USA Rimless, 308 Corbon, .3-9 Savage, 30 Kurz, [[300 AAC Blackout (7.62×35mm)|300 BLK (7.62 × 35 mm)]], 7.5mm Schmidt–Rubin, [[.300 Winchester Magnum|300 Winchester Magnum]], [[.30 Carbine|30 Carbine]], 309 JDJ, [[.30-03 Springfield]], [[.30-06 Springfield]], [[.30-06 JDJ]], .307 GNR, [[7.62×51mm NATO|308 Winchester (7.62 × 51 mm NATO)]], [[.300 Weatherby Magnum|300 Weatherby Magnum]], 30 Army (30-40 Krag),  7.82&nbsp;mm Lazzeroni, and more ||
|-
| 0.307 || 7.8&nbsp;mm || 0.307 in, 7.8&nbsp;mm || [[7.5 FK|7.5 FK (aka 7.5 × 27mm)]]||
|-
| 0.311 || 7.9&nbsp;mm || 0.311 in, 7.92&nbsp;mm || [[.303 British|303 British]], [[7.62×39mm Soviet|7.62 × 39 mm Soviet]], [[7.62×54mmR|7.62 × 54 mmR]], [[7.62×25mm Tokarev|7.62 × 25 mm]], [[7.7×58mm Arisaka|7.7 × 58 mm]] || 7.62×54mmR is actually 7.92&nbsp;mm (Mosin, SVD, PKM, etc.) The same applies to 7.62×39mm (AK-47, AKM, etc.) 
|-
| 0.312 || 7.94&nbsp;mm || 0.312 in, 7.94&nbsp;mm || [[.32 ACP|32 ACP]] || Also known as 7.65×17mm Browning
|- 
| 0.323 || [[8 mm caliber|8 mm]] || 0.323 in, 8.20&nbsp;mm || [[7.92×57mm Mauser|8×57 mm Mauser]], [[.325 WSM|325 WSM]], [[8mm Remington Magnum|8 mm Remington Magnum]], 8&nbsp;mm plastic ([[airsoft]]) BBs || .32 caliber rifle cartridges 
|-
| 0.327 || [[8 mm caliber|8 mm]] || 0.327 in, 8.30&nbsp;mm || [[8 mm Lebel]] || 8x51 mm R (ex 8x50 mm R)
|-
| 0.338 || 8.6&nbsp;mm || 0.338 in || [[.338 Lapua Magnum|338 Lapua Magnum]], [[.338 Norma Magnum|338 Norma Magnum]], [[.338 Winchester Magnum|338 Winchester Magnum]], [[.338-378 Weatherby Magnum|338-378 Weatherby Magnum]] || C14 Timberwolf (Canadian Forces) 
|-
| 0.355 ||  [[9 mm caliber|9&nbsp;mm]] || 0.355 in, 9.01&nbsp;mm || 9&nbsp;mm Luger (aka [[9×19 mm Parabellum]], aka 9&nbsp;mm NATO), 9&nbsp;mm Ultra, 9&nbsp;mm Bayard Long, [[9mm Mauser|9 mm Mauser]], 9&nbsp;mm Winchester Magnum, 9&nbsp;mm Glisenti, 9 × 21&nbsp;mm, 9 × 23&nbsp;mm Winchester, 9&nbsp;mm Mi-Bullet, [[9mm Steyr|9 mm Steyr]], .356 Team Smith & Wesson, 9&nbsp;mm Federal,  9&nbsp;mm × 25&nbsp;mm Dillon, 9mm Action Express, [[.357 SIG|357 SIG]], [[.380 ACP]] (9mm Short) ||
|-
| 0.356 || 9&nbsp;mm || 0.356 in ||  9×56mm Mannlicher–Schoenauer, 9&nbsp;mm × 57mm Mauser ||
|-
| 0.357 || [[9 mm caliber|9&nbsp;mm]] || 0.357 in, 9.1&nbsp;mm ||  [[.38 Super|38 Super]], [[.38 Special|38 Special]], [[.38 S&W]], [[.357 Magnum|357 Magnum]], [[.35 Remington|35 Remington]], [[9mm Browning Long|9 mm Browning Long]]|| Handgun cartridges known as "38" are .357 caliber. Generally .357 for revolvers and rifles, .355 in autoloaders
|-
| 0.363 || 9&nbsp;mm || 0.365 in, 9.27&nbsp;mm || [[9×18mm Makarov|9 × 18 mm Makarov]] ||
|-
| 0.365 || 9.3&nbsp;mm ||0.365 in || [[9×39mm|9 × 39 mm]], [[9.3×62mm|9.3 × 62 mm]], [[9.3×64mm Brenneke|9.3 × 64 mm Brenneke]], [[9.3×72mmR|9.3 × 72 mmR]], [[9.3×74mmR|9.3 × 74 mmR]] ||
|-
| 0.375 || 9.5&nbsp;mm || 0.375 in, 9.53&nbsp;mm || [[.375 H&H Magnum|375 H&H Magnum]], [[9.5×57mm Mannlicher–Schönauer|9.5 × 57 mm Mannlicher–Schönauer (375 Rimless Nitro Express (RNE) × 2¼)]]||
|-
| 0.40 || [[10 mm caliber|10&nbsp;mm]] || 0.400 in || [[.40 S&W|40 S&W]], [[10mm Auto|10 mm Auto]] || 
|-
|0.410
|10.4&nbsp;mm
|0.410 in
|[[.410 bore|410 bore]]
|
|
|-
| 0.44 || 10.9&nbsp;mm || 0.429 in ||[[.444 Marlin|444 Marlin]], [[.44 Russian|44 S&W Russian]], [[.44 S&W Special|44 S&W Special]], [[.44 Remington Magnum|44 Remington Magnum]], [[.44 Auto Mag|44 Auto Mag]], [[.440 Cor-Bon|440 Cor-Bon]], 44/454 JDJ Woodswalker ||
|-
| 0.45 || 11.43&nbsp;mm || 0.451–0.454 in || [[.45 ACP|45 ACP]], [[.45 GAP|45 GAP]], [[.454 Casull|454 Casull]], [[.45 Long Colt|45 Long Colt]], [[.455 Webley|455 Webley]], [[.45 Schofield|45 Schofield]], [[.460 S&W Magnum|460 S&W Magnum]] || Bullet diameter depends on bullet type/material. Generally 0.451 in for [[full metal jacket bullet]]s and 0.454 in for lead bullets.
|-
| 0.50 || 12.7&nbsp;mm || 0.510&nbsp;in, 12.95&nbsp;mm ||  [[.50 BMG|50 BMG]], [[.50 Action Express|50 Action Express]], [[12.7×108mm]], [[.500 S&W Magnum|500 S&W Magnum]], [[.50 Beowulf|50 Beowulf]], [[12.7x55mm]]||[[M2 Browning machine gun]] and other heavy machine guns, long-range rifles typified by [[Barrett Firearms Manufacturing|Barrett]] products. [[IMI Desert Eagle|Desert Eagle]] handgun.
|}