I just posted this on another site where some guy was recommending hunting with a Crosman 760.. (note that pyramid air and other responsible air gun sellers do not recommend the 760 or any other air rifle or pistol for hunting,, other than mice,,) But… this was my post, regarding guns with muzzle velocities in the 600-700 range or less: ——-
“Some years ago , Dr Beeman (Beeman Air Rifles –the classic hunters gun) stated that an air gun which puts out 5 to 7 ft pounds of muzzle energy (which your 760 does Only if Fully Pumped) is sufficient for a humane kill on a squirrel out to 15 yards, (3 car lengths ) and a rabbit , can be killed humanely with such a gun at no more than 5 yards (1 car length) ..And,, those are IF the shooter places the pellet in the hearts or brains,, which means you Must be capable of reliably and regularly hitting a target dot of 1 inch or less at those ranges.. A shot anywhere else MAY kill an animal.. or disable the animal enough to go finish it off with a head shot up close , or break its neck with your hands .. but may more likely not kill it rapidly, and the shooter may assume he missed entirely, but in reality the creature ran off to die slowly and miserably from bleeding or infection, A reasonable Minimum velocity is 800 with .22 pellets and 1000 with .177. A muzzle speed less than 1100 will not break the sound barrier and will not make that loud crack.. A 1200 FPS Air gun is rated with light pellets,, if you use heavy hunting pellets.. the speed will be about 1000 fps and therefore meet your need for quiet shots.. I suggest a Gamo, ($150-$200+, or the lesser known Hatsun Air rifles about $110… in .22 cal. Also please do not shoot squirrels and rabbits in the spring,, if you kill a female,, there will be about 6 less critters to shoot next year, as the babies will die inside her or starve in the nest.