Below is a list of common firearms cartridges with their English designation and actual bullet diameter (groove diameter) in inches. The chart also shows actual bullet diameter in millimeters as well as the standard metric designation for that bullet size.
| Common cartridges |
Nominal diameter (in) |
Nominal diameter (mm) |
Metric designation (mm) |
| |
|
|
|
| .17 Remington, .17 HMR |
0.172 |
4.37 |
4.40 |
| .204 Ruger |
0.204 |
5.18 |
5.00 |
| .22 Long Rifle ( Includes rimfire variants such as .22 short, CB etc. ) |
0.223 |
5.66 |
5.60 |
| .223 Remington, 5.56 NATO, .222 Remington .22-250 Remington |
0.224 |
5.69 |
5.56 |
| .243 Winchester, 6 mm Remington |
0.243 |
6.17 |
6.00 |
| .25 ACP |
0.250 |
6.35 |
6.35 |
| .257 Roberts, .25-06 Remington, .250 Savage |
0.257 |
6.53 |
6.50 |
| 6.5 x 55, .260 Remington, 6.5 Grendel |
0.264 |
6.71 |
6.50 |
| .270 Winchester, 6.8 SPC |
0.277 |
7.04 |
6.80 |
| 7 mm Remington Magnum, 7 x 57, 7mm-08 Remington |
0.284 |
7.21 |
7.00 |
| 30-06, .308 Winchester (7.62mm NATO), |
0.308 |
7.82 |
7.82 |
| .300 Winchester Magnum , .300 WSM, |
0.308 |
7.82 |
7.82 |
| .300 Weatherby, .300 Blackout |
0.308 |
7.82 |
7.82 |
| .303 British, 7.62x39, 7.62x54R |
0.311 |
7.90 |
7.62 |
| .32 ACP |
0.309 |
7.85 |
7.65 |
| .32 S&W, 32 H&R Magnum, 32 H&R Magnum |
0.312 |
7.92 |
7.50 |
| 8x57, .325 WSM, 8 mm Remington Magnum |
0.323 |
8.20 |
8.00 |
| .338 Lapua, .338 Winchester Magnum, .338 Federal |
0.338 |
8.59 |
8.58 |
| 9mm Parabellum (Luger), 9x18 Makarov |
0.355 |
9.02 |
9.00 |
| .38 Special, .380 ACP, .357 Magnum, .357 SIG, .35 Remington |
0.357 |
9.07 |
9.00 |
| .38-40 |
0.400 |
10.16 |
10.00 |
| .40 S&W, 10 mm Auto |
0.400 |
10.16 |
10.00 |
| .404 Jeffery |
0.423 |
10.74 |
10.25 |
| .405 Winchester |
0.411 |
10.44 |
10.75 |
| .41 Magnum .41 Action Express |
0.410 |
10.41 |
10.25 |
| .416 Barrett, .416 Remington Magnum, .416 Rigby, .416 Weatherby Magnum |
0.416 |
10.57 |
10.60 |
| .44-40 Winchester |
0.427 |
10.85 |
10.80 |
| .44 Special, .44 Magnum |
0.429 |
10.90 |
10.80 |
| .45 Colt (modern guns), .454 Casull, .45 ACP, 45GAP, .450 Bushmaster |
0.452 |
11.48 |
11.45 |
| .45 Colt (Early guns before WW 2) |
0.454 |
11.53 |
11.53 |
| .458 Winchester Mag, .458 Lott, .460 Weatherby, .45-70 Gov't , .458 SOCOM |
0.458 |
11.63 |
11.60 |
| .480 Ruger, .475 Linebaugh |
0.475 |
12.07 |
12.00 |
| .50 AE, .500 S&W, .50 Beowulf |
0.500 |
12.70 |
12.70 |
| .50 BMG |
0.510 |
12.95 |
12.95 |
|
|
