It is the Zeliska 600 Nitro Express Revolver There seems to be no limit to how big a revolver someone will build. This is a big one (almost as big as the fake .50 BMG revolver posted earlier). The case is 3 inches long and the cartridge overall length is 3.7 inches. The bullet is actually .620 inches in diameter, and is typically 900gr in weight. It's was made to custom order by Pfeifer-Waffen of Austria. Here are the cartridge specs. (You can also order it in .458 Win Mag.)
Factory, I'd probably say the 500 Magnum
If you are referring to the present, today's most powerful sub-machine gun is the H&K UMP .45 cal sub-machine gun, or the Kriss Vector SMG. if you are referring to the past however then its undeniably the Tommy Gun. also a .45 cal sub-machine gun.
In the US, the handgun In the World, probably the AK-47 The handgun, really? Be specific. and by the way, you're wrong. If you mean most widely used, then yes, the AK 47 because its cheap. If you mean most liked, then definitely not the AK 47, because its a piece of crap.
.500 Smith & Wesson Magnum is the most powerful dedicated handgun cartridge. However, pistols such as Thompson-Center Contender are capable of chambering rifle cartridges such as .45-70 and .30-30.
The worlds most powerful destroyer is the Sejong the Great class destroyer. These ships are operated by the Republic of Korea Navy. There are three in the current fleet with each having a capacity for 400 crew members. The weapons each ship is equipped with are 16 anti-ship missiles, 6 torpedoes, 3 cruise missiles, helicopters and a 1.5 inch naval gun.
Factory, I'd probably say the 500 Magnum
Not even close. There are several more powerful handgun cartridges, not counting the single shot pistols that use rifle cartridges. While Dirty Harry may have proclaimed it to be "The most powerful handgun in the world"- it is not.
600 Nitro Express
My guess is the M1917 Browning machine gun in 30/06
M2 can be hand held, but, that is the exception. MP5 in 10mm is along the lines of what you might be asking about.
Other than a toy gun or water gun, the next most powerful one a citizen can have without a permit is a "B.B. gun".
The IS-2 and IS-3 "Josef Stalin". They boasted a 122mm main gun, and remained the most powerful tanks in the world for almost 20 years after the end of the war.
yes but it wont be as powerful
50 cal. machine gun. i don't know who decided to use it.
577 T Rex
star cannon
The magnum .55 is the most powerful, but some Desert Eagle has the highest calibre bullet.