7.62 mm (or 30 caliber) and 5.56 mm (or 223 caliber) are common rifle cartridges. Pistols, machine guns, and artillery will of course be different from these.
There are thousands of different cartridges for guns in different calibers. Technically, caliber refers to the diameter of the inside of the barrel.
Yes, the Medusa is one.
No such thing. You can have small caliber but not low caliber.
Some guns yes, but most guns would require gunsmithing to change caliber.
Not really. Some ae .177 caliber and fire steel shot, some are 6mm and fire plastic shot. Different guns have different parts, and work differently.
Pellet guns tend to come in two standard caliber sizes. The first smaller caliber is the most common for pellets guns and is .177 caliber. The second is .22 caliber that can be found on some higher powered pellet gun models.
The caliber
generally you can establish the "power" of a weapon by its caliber this works great with small arms, once you get in to bigger guns ie artillery and ships guns there is more to it then just caliber. but even with small arms the power can range widly with each bullet comes different powder loads, different lead weights, and different types of bullets.
.68. Almost all guns are this caliber.
The 308 caliber guns are more expensive than 5.56 assault rifles.
they make guns? <><><> Gunsmiths did indeed make guns. Today some gunsmiths do still make guns, but most repair and adjust guns. They may repair or replace parts, chamber a firearm for a different caliber, mount scopes, clean guns, and bed rifles to a stock.