The difference in measurement units for bullets—caliber (cal) and millimeters (mm)—stems from the historical development of firearms in different regions. Caliber, primarily used in the United States, typically refers to the diameter of the bullet in inches, while millimeters, commonly used in Europe and many other parts of the world, measures the diameter in metric units. This distinction reflects the cultural and manufacturing practices of each area, leading to varying standards for ammunition. Consequently, some cartridges are specified in inches (like .45 ACP) and others in millimeters (like 9mm Luger).
No
yes all bullets can exeplode if not look after
No. They are not designed to fire a 17 cal bullet
No. Size of the bullets are different.
NO.
3/4 of an inch is 19 mm.
Yes, there are .20 cal bullets. Not very common, they are typically very small bullets for high velocity rifles. The Ruger .204 is about a .20 caliber cartridge.
no. nor can you fit a 40 cal shell into a 9mm chamber...............
No, there are .357 caliber bullets that are not magnum, but they are in the minority.
.32 caliber
It depends on the bullet weights. The 9 mm (AKA 9x19 mm, 9 mm Luger, or 9 mm Parabellum) is faster than the .380 ACP (AKA 9 mm Kurz) except when you compare the lightest .380 bullets to the heaviest 9 mm bullets. If you compare the same bullet weights in each, the 9 mm is always faster.
22. cal bullets bro its pretty self explainatory