Because of this, the groove measurement (and the actual diameter of the bullet) is. However, the 7.62x39mm cartridge (which was designed in the Soviet Union), measures bullet diameter using land measurements instead of groove measurements. 30-06 Springfield since they are both 7.62mm cartridges. At first glance, this cartridge would appear to use a bullet with the same diameter as the. Take the 7.62x39mm cartridge used by the AK-47 as an example. To make things even more confusing, most cartridges that were designed in other countries use land measurements. 30-06) in order to form a good seal in the barrel. 308″ because the bullet must closely match the groove diameter (.308″ in a. So, even though the bore of the rifle (measured across the lands) is. 30-06 Springfield is an American designed cartridge and most (but not all) cartridges originating in the United States use groove measurements (which are larger than land measurements) when measuring bullet diameter.
The caliber of a rifled barrel is measured one of two ways: either by measuring the distance between opposing lands (high points in the rifling) or opposing grooves (low points in the rifling) in the barrel.
Unfortunately, it seems like the deeper you dig, the more complicated and confusing things seem to get. However, if you want more specific details, then you’ll need to dig a little deeper. If you are looking for an approximation of the bore size or bullet diameter so that you buy the appropriate sized gun cleaning supplies, then that is all you need to know.
The opposite is also true: divide a given caliber expressed in millimeters by 25.4 in order to convert it to inches.įor example. Therefore, multiply a bullet or bore caliber given in inches by 25.4 in order to convert it to millimeters. There are 10 millimeters (mm) in 1 centimeter (cm) and 2.54 centimeters in 1 inch (in). Switching between the metric (millimeters) and imperial (inches) systems of measurement is relatively straightforward. Read on to find out exactly how to convert caliber to mm. However, I’m attempting to clear up some of the confusion in this article. Because of these factors, deciphering the actual diameter of a bullet or the bore size of a firearm can be bewildering. In addition to using different units of measurement, different countries sometimes use different methods of measuring caliber. HOW TO CONVERT CALIBER TO MM (AND VICE VERSA)Ĭaliber is the approximate internal diameter of the barrel on a particular firearm or the diameter of a bullet and is usually expressed in inches or millimeters. John McAdams over at The Big Game Hunting Blog did us a huge favor by clarifying some of the general misconceptions on converting caliber to mm and vice versa. We wanted to clear up some of the confusion as to which caliber and mm to use for which types of guns.
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