Tue. Dec 10th, 2019

Spotter Up

In Depth Tactical Solutions

Common Ammunition Conversion Guide

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by Frank Moss

Here is a guide to ammunition calibers and their imperial or metric sizing.

Inch Caliber

Metric Caliber

Typical Bullet Diameter

Common Cartridges

Notes

.20, .2045 mm0.204 in.204 Ruger, 5 mm Remington Rimfire Magnum
.225.56 mm0.223-0.224 in.22 Long Rifle, .222 Remington, .223 Remington, 5.56×45mm NATO, 5.7 x 28 mm, .22-250 Remington, .22 Airgun
.246 mm0.243 in.243 Winchester, 6 mm Remington
.256.35 mm0.25 in, 6.35 mm.25 ACP, 6.35x16mmSRa.k.a. .25 Auto and 6.35 mm Browning
.266.5 mm0.264 in, 6.7 mm6.5 x 55 mm, .260 Remingtoncartridges commonly known as 6.5 mm
.276.8 mm0.277 in, 7.035 mm.270 Winchester, 6.8 SPC
.287 mm0.284 in, 7.213 mm.280 Remington, 7 mm Remington Magnum, 7 x 57 mm, 7mm-08 Remington, 7 x 33 mm Sakocommonly called 7 mm
.307.62 mm0.308 in300 AAC Blackout, 30-06, .308 Winchester (7.62x51mm NATO), .300 Winchester Magnum, 7.82 Lazzeroni PatriotAmerican “.30 caliber”
.3037.62 mm0.311 in – 0.312 in.303 British, 7.62×39, 7.62x54R, 7.62×25Other “.30 caliber”, note the mis-labelling of the Russian “7.62” rounds where neither the bore nor the groove diameter is 7.62mm
.3238 mm0.323 in8x57mm IS, .325 WSM, 8 mm Remington Magnum.32 caliber rifle cartridges
.3579 mm0.355-0.357 in.38 Special, .380 ACP, .357 Magnum, .357 SIG, .35 Remington, 9×19mm Parabellum, 9x18mm MakarovHandgun cartridges known as “38” are .357 caliber. Generally .357 for revolvers and rifles, .355 in autoloaders
.4010 mm0.400 in.40 S&W, 10 mm Auto
.4511.43 mm0.450 in.45 ACP, .45 GAP, .454 Casull, .45 Long Colt
.5012.7 mm0.510 in (12.95 mm).50 BMG, 12.7 x 108 mmM2 Browning machine gun and other heavy machine guns, long range rifles typified by Barrett Firearms Manufacturing products

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