Most .22 BOLT action, pump and LEVER action rifles that are fed from a tube magazine will handle shorts, longs, and long rifles. Remington produced several auto loaders that wil handle mixed ammo- the Remington 550 may be the best known.
No
No.
Only what it is chambered for.
NO!!
a gunsmith needs to check both the ammo and rifle.
yes. the 5.56 is the 223 caliber ammo.
I have had good success with Federal rifle ammo.
No, the 22 Mag will not fit.
You can only shoot what is printed on the barrel. Mag and short mag are not the same.
Yes.
ABOUT 200 yards, depending on rifle, ammo, and what you call accurately.
If your Iver Johnson is marked for the .22 WMR.then yes,if it is not then do not attempt to load or shoot .22magnum ammo in your rifle.