The term "squirrel gun" was used with muzzle loading rifles that were smaller caliber than deer rifles. There was no one set caliber, but many were in .32 caliber, where a deer rifle would be .50, .54 or larger.
$150-$275, depending on condition.
A regular BB gun will probably kill a squirrel if the seals are good, ie it is relatively new, and you are shooting .177 caliber BBs, not airsoft pellets. A pellet rifle may shoot around 1000 feet per second, and that definitely has the clout to whack a squirrel. Most BB guns are capable of killing a squirrel.
In the days of black powder, muzzle-loading firearms, a large caliber lead bullet was standard- somewhere around .69 caliber. While this was good for deer and bear, it was far too powerful for small game, such as squirrel. A much smaller caliber rifle was developed, typically firing a .32 or smaller bullet. This was far less destructive of the meat of small game, and cost far less to shoot. These smaller caliber guns became nicknamed "Squirrel rifles".
the 12 guage is a caliber not a gun
a .45 caliber.
What caliber of man are you looking for? What caliber of gun are you looking for?
The short answer is no. The longer answer is, you might be able to get a .40 caliber cartridge to fire from a .45 caliber gun, but it may damage the gun, and even if it doesn't damage the gun, it will cause other problems. In general (with only a few exceptions) you should never try to fire any cartridge in any gun other than a gun designed for that caliber.
It is the standard .68 caliber
Caliber has nothing to do with it.
smaller the number, the smaller the caliber.
The word "caliber" refers to the diameter of the internal bore of a gun or firearm barrel.
45 caliber Machine Gun and 50 caliber machine gun