Calibre refers to the diameter of the barrel of a gun. Also known as the bore.
It is referred to in imperial measure or metric depending on the manufacturer
Most BB are .177 caliber but there are a few that are .175 caliber.
about 40 caliber and above :)
They are .175 caliber
9
Big bore rifles are generally considered to be 40 caliber and above.
No. He was shot by a 9mm.
A 410 shotgun is basically a 41 caliber smoothbore. A 45 caliber round may fit in the chamber, but the bullet is too big. Don't do it.
Any bullet that has a diameter of one half inch is a .50 caliber bullet. There are different .50 caliber bullets- my Hawken muzzle loading rifle shoots a .50 caliber lead bullet, but different from the .50 Browning Machine Gun (that is also used in the .50 Barret sniper rifle)
We assume you mean .300 caliber. That is 30/100ths of an inch. A bit smaller than the diameter of a regular pencil.
No. The bullet is too big. A 30-30 is a .30 caliber bullet. a .38 bullet is .357 caliber
In metric measurements, the .45 ACP is referred to as 11.43x23mm.
As big as someone aspires to make it, I suppose.