20 mm cannons.
No. The AK-47 is only chambered in 7.62x39mm. A 5.56x45mm round would not fit in its chamber. However, the modernized AK-101 is chambered in 5.56mm.
The F22 can mount a 20 mm Gatling Gun, with 480 rounds of ammo. Primary weapons are not the gun, but missles.
It is the same cartridge
6.35 mm is also known as .25ACP, or .25 Auto for short. Most gun shops will have this in stock.
Some revolvers will take .357, .38 and 9 mm. Whether or not a particular revolver will or not is a different issue. One police department went to them and went to .45 the next year. They may not have worked very well.
11.5 mm bullet diameter
Some folks rather have a 357 revolver then a 9 MM semi auto as a revolver if it misfires you just pull the trigger again If a semi auto misfires you lose the battle as you have to manually reject the ammo and hope the next round fires. Of all the semi autos I did fire I happen to like the sig 226 9 MM the best
357 millimeters is 1 foot 2 inches.
Most gun shops, sporting goods stores. Ask for 8mm Mauser- that is the common name, even if it really is 7.9
"Best" is subjective. A really good definitition of best is, the ammo that functions the most reliably in your particular gun.
No. The .357 SIG is a bottlenecked cartridge. It is fatter and longer than the 9mm Parabellum. ALSO, please note that many auto pistol cartridges headspace on the case mouth, and are VERY sensitive to length differences.