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No. The case of a 22 WMR is longer than that of a 22 lr, so the cartridge won't fit in a rifle that is chambered for 22 lr.
Bullet weight is immaterial. If it is chambered for 22 LR, then any 22 LR load is fine.
The mini-mag should still be .22 LR.
The weapon can fire 22 short, long or long rifle.
Let's get the names straight- there are .22 Long Rifle (LR) cartridges, and there are .22 Magnum (.22 WMR) They DO NOT interchange (although there are a few revolvers with 2 cylinders that can CONVERT from one to the other). The.22 Magnum is not only more powerful, and longer, but it is larger in diameter than the .22 LR. SOME .22 LR firearms can safely short .22 Shorts, but LR and Magnum do not swap.
No
NO. .22 Magnum has a larger diameter case than .22 LR. The LR case will split.
This requires the services of a gunsmith.
No. It is a 22LR semiauto, and needs 22 LR ammo to cycle the action.
No
In most cases, no. The .22 Extra Long is an obsolete cartridge that has not been manufactured in many years. The .22 Winchester Magnum Rimfire IS currently manufactured, but does not interchange with .22 LR. Despite the similar names, they are different diameters.
22 LR