squirrel
When you say Air Rifle you are referring to a pellet rifle not a firearm. At present there are no 300 Cal air rifle being made.
No it's not a requirement but it helps
yes
Medium size game like a fox or raccoon.
It has to be unloaded.
yes
Rifle
No.... You can only hunt with 1 rifle at a time
No
It is NOT designed to hunt large game. it's for small game (Rabbits) See the owners manual.
yes. you can use an air rifle/ pellet gun but make sure its powerful enough to kill it or a bow but make sure you are a safe distance from houses. you must also be licensed to hunt them