Caliber
Metric and US customary
The following table lists some of the commonly used calibers where both metric and US customary 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.

Caliber

Section Title: Metric and US customary
Table Section Text: The following table lists some of the commonly used calibers where both metric and US customary 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.

Inch caliber	Metric caliber	Typical bullet diameter	Common cartridges	Notes

.172	4 mm	0.172 in	.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, 4.39×39Rmm SPS

.20, .204	5 mm	0.204 in	.204 Ruger, 5mm Remington Rimfire Magnum

.221	5.45 mm	0.221 in	5.45×39mm Russian family	Russian Mil Std

.22	5.6 mm	0.223 in	.22 Short, .22 Long, .22 Long Rifle, .22 Stinger, 22 Extra Long, .297/230 Morris Extra Long, .22 Hornet, .22 Rem Automatic, 5.66 x39 MPS, .22 Rem Jet

.224	5.7 mm	0.224 in	.218 Bee, .219 Zipper, .22 Hornet-K, .220 Swift, .222 Remington, .222 Remington Magnum, .223 Remington, 5.56×45mm NATO, 5.7×28mm, .22 TCM, 5.8 × 42 Chinese, .224 Weatherby Magnum, .225 Winchester, .223 Winchester Super Short Magnum (Obsolete) .223 Ackley Improved, .219 Donaldson Wasp, .221 Remington Fireball, .22-250 Remington and many more

.243	6 mm	0.243 in	.243 Winchester, .244 Remington, 6mm Remington, 6 mm plastic airsoft BBs, 6mm Whisper, 6mm PPC, 6mm Bench Rest Remington, 6×45mm, 6×47mm, 6mm Cheetah, .240 Weatherby, 6×62 Freres, 6mm Norma BR, 6XC Tubb, 6mm JDJ, 6mm SAW, 6-250 Walker, 6.17 Spitfire, 6.17 Flash, 6mm Lee Navy, and more,

.25	6.35 mm	0.257 in, 6.35 mm	.25 ACP (0.251"), 250/3000 Savage, 257 Roberts, 25-06 (0.257"),	also called .25 Auto and 6.35mm Browning

.26	6.5 mm	0.264 in, 6.7 mm	6.5×55mm, .260 Remington, 26 Nosler, 6.5 Creedmoor, 6.5x47 Lapua	cartridges commonly known as '6.5 mm'

.27	6.8 mm	0.277 in, 7.035 mm	.270 Winchester, 6.8 SPC

.284	7 mm	0.284 in, 7.213 mm	.280 Remington, 7mm-08 Remington, 7mm Weatherby Magnum, 7mm Remington Magnum, 7×57mm Mauser, 7×64mm	commonly called '7 mm'

.308	7.62 mm	0.308 in, 7.82 mm	.30 Luger (7.65 × 21mm Luger), .30-30 Win, 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), 7.5mm Schmidt–Rubin, .300 Winchester Magnum, .30 Carbine, 309 JDJ, .30-03, .30-06 Springfield, .30-06 JDJ, .307 GNR, .308 Winchester (7.62×51mm NATO), .300 Weatherby Magnum, .30 Army (.30-40 Krag), 7.82mm Lazzeroni, and dozens more

.311	7.9 mm	0.311 in, 7.92 mm	.303 British, 7.62×39mm Soviet, 7.62×54mmR, 7.62×25mm, 7.7×58mm	7.62×54mmR is actually 7.92 mm (Mosin, SVD, PKM, etc.) The same applies to 7.62×39mm (AK-47, AKM, etc.)

.312	7.94 mm	0.312 in, 7.94 mm	.32 ACP	Also known as 7.65 × 17 mm Browning

.323	8 mm	0.323 in, 8.20 mm	8×57mm IS, .325 WSM, 8mm Remington Magnum, 8 mm plastic (airsoft) BBs	.32 caliber rifle cartridges

.338	8.6 mm	0.338 in	.338 Lapua, .338 Norma Magnum, .338 Winchester Magnum, .338-378 Weatherby Magnum	C14 Timberwolf (Canadian Forces)

.355	9 mm	0.355 in	9mm Luger, 9mm Ultra, 9mm Bayard Long, 9mm Browning Long, 9mm Mauser, 9mm Winchester Magnum, 9mm Glisenti, 9 × 21mm, 9 × 23mm Winchester, 9mm Mi-Bullet, 9mm Steyr, .356 Team Smith & Wesson, 9mm Federal, 9mm × 25mm Dillon, 9mm Action Express

.356	9 mm	0.356 in	.380 ACP (9mm Short), 9×56mm Mannlicher–Schoenauer, 9mm × 57mm Mauser

.357	9 mm	0.357 in	.38 Super, .38 Special, .357 Magnum, .357 SIG, .35 Remington	Handgun cartridges known as "38" are .357 caliber. Generally .357 for revolvers and rifles, .355 in autoloaders

.363	9 mm	0.363 in	9×18mm Makarov

.365	9.3 mm	0.365 in	9.3×62mm, 9.3×64mm Brenneke, 9.3×72mmR, 9.3×74mmR

.375	9.5 mm	0.375 in, 9.53 mm	.375 H&H Magnum, 9.5×57mm Mannlicher–Schönauer (.375 Rimless Nitro Express (RNE) × 2¼)

.40	10 mm	0.400 in	.40 S&W, 10mm Auto

.44	10.9 mm	0.429 in	.444 Marlin, .44 S&W Russian, .44 S&W Special, .44 Remington Magnum, .44 Auto Mag, .440 Cor-Bon, .44/454 JDJ Woodswalker

.45	11.43 mm	0.451–0.454 in	.45 ACP, .45 GAP, .454 Casull, .45 Long Colt, .455 Webley	Bullet diameter depends on bullet type/material. Generally 0.451 in for full metal jacket bullets and 0.454 in for lead bullets.

.50	12.7 mm	0.510 in, 12.95 mm	.50 BMG, .50 Action Express, 12.7×108mm, .500 S&W Magnum	M2 Browning machine gun and other heavy machine guns, long-range rifles typified by Barrett products. Desert Eagle handgun.

Sentence(s)

The .308 Winchester (7.62×51mm NATO) uses a .308-in diameter (7.82-mm) bullet.

final_sentence: The .308 Winchester (7.62×51mm NATO) uses a .308-in diameter (7.82-mm) bullet.