Here is the statutory definition of a firearm:

Sec. 53a-3. Definitions. Except where different meanings are expressly specified, the following terms have the following meanings when used in this title:(19) "Firearm" means any sawed-off shotgun, machine gun, rifle, shotgun, pistol, revolver or other weapon, whether loaded or unloaded from which a shot may be discharged;

This statute includes pellet guns and BB guns under the definition of firearm as it is a "other weapon"...from which a shot may be discharged. As such, anyone hunting with a pellet gun or BB gun must comply with all firearms hunting laws, i.e., 500 ft rule, in season, with a license, permission of the property owner, etc. The 10 acre rule applies specifically to center fire rifles of .270/6mm or larger for deer hunting. You can coyote hunt on less than 10 acres with a center fire rifle (I know, what's the difference between hunting a deer or coyote with a high powered rifle....I didn't write the law) Pellet guns are not center fire rifles and you can't deer hunt with them as the caliber is too small, so that's a moot point.