Many would say the 22 Long Rifle.
Are you asking about caliber or the actual size of the rifle?
Take the rifle to a gun shop so they can figure out what make, model and caliber rifle you have. There is no 84 caliber long rifle.
No. It is much too small.
There is no way to give you a brief answer. ONE of my reference books on cartridges is about 2 inches thick, and THAT does not have all of them. Rifle cartridges have been as small as .17 caliber, and as large as .200 caliber. There are thousands of different rifle cartridges.
Nope. It is too small, will fall out of the barrel.
You need a license no matter where you live or how small the caliber. A firearm is a firearm. No ifs, ands, or buts about it.
Small caliber rifle and skis. It is held during Winter Olympics, as far as I know.
Benjamin made a model 347 from 1969 to 1992 it was a pump handle that fired a single shot .177 pellet. As far as I know Benjamen never made a model 357 ( I may be wrong) but they have just come out with the Benjamin Rogue that fires a 357 caliber Pellet. This is PCP (PreCharged Pneumatic) class rifle. These are the most powerful class of air rifles today. The Rogue fires a 8 shot 357 caliber clip. The rifle cost around $1300. The 347 is designed for target and rodent control. The Rogue is designed for small to medium game hunting. The Rogue is not the largest caliber pellet rifle. Today the largest is the 50 caliber Dragon Claw air rifle by Sam Yang.
That rifle was manufactured prior to 1968 when the Gun Control Act was passed. Prior to then, small caliber rifles were not required to have a serial number and mass produced ones often did not.
It depends on the size of the hog, The size of the caliber, the weight of the pellet and if you can get in a good head shot. Assuming you are using a .177 caliber rifle. (your stretching the limits of the rifle) I would select a H&N Baracuda Match .177 Cal 10.65 grain pellet. Don't get hug up on speed. A heavy pellet will fly slower than a lightweight pellet but will fly straighter and have more knock down power than a lightweight pellet. Hopefully your going after really small hogs, because I think you are stretching the limits of you rifle if it's a .177 caliber air rifle. I recommend a larger caliber, but it's up to you.
The best caliber rifle is entirely dependent on what game you are hunting. For varmints (small pest animals like gophers, moles, and prairie dogs) as .22 LR would be appropriate. For deer and elk, I would chose one of the .30 caliber options, either 30.06 or .308. For moose, or cape buffalo, I might go up to a .454.
'22LR' refers to .22 caliber "Long Rifle" cartridges. These are rimfire cartridges used in many handguns and small sport & target rifles.