They measure the width of the gun barrel in fractions of an inch. A 38 caliber will be .38 of an inch. The bullet projectile itself is a little less wide.
The "mean" of a group of numbers is their "average". It doesn't tell you what the numbers are, or even how many numbers there are.
No, the geometric mean is not the same as the mean of two numbers.
Given a set of numbers, and its mean, we can find the difference between each of the numbers and the mean. If we take the mean of these differences, the result is called the mean deviation of the numbers.
Mean = Total of the numbers / n So total of the numbers = n*mean
The numbers on gunpowder typically represent the grain size or the type of gunpowder. For example, in black powder, the numbers may indicate the granulation, such as "FFg" or "Ffg," where "F" denotes the type and the number indicates the size of the grains. In smokeless powders, the numbers may refer to specific formulations or burn rates, which affect the performance and pressure generated in firearms. These specifications help users select the appropriate powder for their specific ammunition and firearm needs.
The grain numbers on ammunition are the projectiles weight in grains, at 7000 grains to a pound equals 437.5 grains to an ounce.
Its the weight of the ammunition
Glock model
Expanding Full Metal Jacket
Full Metal jacket.
Inventory tracking for firearms. BTW, ammunition does not have a serial number.
Springfield. Like "30-06 SPRG."
Simply put, ammunition that is loaded to a higher pressure to achieve more velocity.
http://www.handgunsmag.com/ammunition/demystplusp_0306-7/index.html
HST are semi-jacketed hollow point ammunition, and the initials are for Hydra Shock Two, indicating that they are the next generation of the Hydra Shock bullet.
It's a warning to the user that the only compatible ammunition for that rifle is the .22 Winchester Magnum Rimfire (22 WMRF), and other types of .22 ammunition are NOT compatible.
The mean is the is the total of the numbers and then dividing by how many numbers.