Varies every couple of years. 30/06 probably
Rifle or handgun?
30/06
Data not in the public domain
same as today- .22 rimfire.
No. MOST of them are. The most popular "22" in the world is the .22 Long rifle cartridge, which IS a rimfire- as is the .22 Short, .22 Long, .22 Extra Long (obsolete), .22 WRF, and the .22 WMR. HOWEVER- there HAVE been .22 centerfire cartridges, such as the .220 Swift, 22-250, and a European cartridge, the .22 Velo Dog. .22 caliber means that the bullet is 22/100ths of an inch in diameter. None of the centerfire rounds will interchange with the .22 LR.
Assault rifle is a legal term, and laws vary place to place. Under MOST of them, it is a centerfire semi-auto rifle larger than 22 caliber, with a removeable magazine that holds more than 10 rounds, and a pistol grip. The SKS does not have a pistol grip, and has a fixed 10 round magazine. Not an assault rifle.
The 30-06 caliber is still in the #1 position as far as popularity by the shooting public.The 223 is running second,and the 243Win.caliber is a distant third.
Any caliber can do the job. Most states regulate what can be used.
Not necessarily. Centerfire and rimfire refer to the cartridge. Those with a primer in the center of the cartridge base are centerfire, and those with propellant packed in the rim are rimfire. Popular centerfire cartridges include the .223 Remington, .380 Winchester, .30-30, .30-06, 7.62x39, 7.62x54R, etc. The most commonly known rimfire cartridge is the .22 Long Rifle. There are bolt action rifles manufactured for each type of cartridge.
Both Shinsung and Sam Yang make a 50 caliber air rifle. The largest caliber Weinrauch makes is a .25 caliber.
Good rifle, good caliber for most uses. Did you have a specific question?
The most common hand-gun caliber used to be 9mm Luger. Recently I bought a pistol and took a self-defense course. Now it seems the most popular caliber is the.40 Caliber Smith and Wesson.********There are popular, and there are most common. The most common gun caliber is .22 rimfire, in terms of the total number sold.