l have a Crosman 66 Power Master
7.9 Grain Lead .177 Flat Headed Pellet
625FPS
l can easily hit a Pop can at 50FT or More

it could.

Maybe, more likely would wound it severely.
Leave squirrels be!

If you hit a vital area you stand a good chance of killing the squirrel.
Heart and lungs- head or spinal shots are most effective.
Your weapon is not fast enough to humanely shoot at moving targets so a still shot as close as you can get will work best.
Hunt safe.

Yes it can kill a squirrel if you aim at its chest or head. The squirrels skin is not very thick and with the power your rifle has it can easily kill one.

With in 50 feet and hit in a vital organ it will. Do you know how to skin, clean and cook a squirrel? other wise there is not much sense in shooting one.

you could depending where u hit it

If you are a good shot, then yeah. But make sure you're not making it suffer. If you are, bag the pellet rifle and get a rifle with a few more balls. Get like a Savage. They are good rifles. Try a 17 or something.

Your gun has a muzzle energy of 6.94 ft-lbs of energy. You need 3 ft-lbs of impact energy (415 fps impact velocity with 8 grain pellets) to kill a squirrel. Your pellet rifle will deliver that out to around 20-25 yards & can kill squirrels at that distance provided u can hit the squirrel in either vital organs or the head at those distances.

That said. Personally l would not try using to kill squirrels at beyond about 50 feet because there is not a lot of margin for error at longer range (which you'd get with a more powerful airgun).

All weapons should be handled as if they WILL kill, for safety purposes. The first rule of gun safety is, ''Never point ur muzzle at anything u do not intend to kill.'' So if ur question is ''Can l plink at squirrels just to scare them, WITHOUT killing them?'' then the answer is ''Do not try it!''

However, if ur question is, '' l want to go squirrel hunting; is this gun adequate?'' bear in mind that a hunter is obliged to kill humanely & legally. l do not consider ur weapon the best choice for a humane kill. It may not even be legal. Check the hunting regulations for ur jurisdiction to see if certain equipment is prescribed or prohibited. In the process, u will also learn other important information, such as license requirements, seasons, & bag limits.

HEAD SHOT!!!!!! but if it dosent completely kill it then you need to take further action and cut its throat (be carefull the animal can still bite if its not dead)!!!!

A - Your rifle is a 5.39fpe rifle >at most< with BBs
Crosman ''claims'' >UP TO< 690fps with BBs
690x690x5.1 / 450240 = 5.39fpe

Pellets will increase the effectiveness/power of ur rifle SLIGHTLY. Probably not to 625fps with 7.9gr pellets

625fps with 7.9gr pellets
625x625x7.9 / 450240 = 6.85fpe

>>625fps with 7.9gr flat head pellets<<
1 - Generally speaking, domed pellets r much better for hunting than wadcutters
2 - 625fps - l hope u chronographed that - Because most 664s drop to around 575fps with 7.9gr Crosman Premier lights
3 - >>Hit a Pop can at 50 feet<< You need to be able to hit a .50c piece every time, a quarter is better. >Head shots only

l would not even think about taking a shot(squirrel) beyond 45 feet with that rifle/pellet combination, even if you're Buffalo Bill

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If u want to hunt small game with a multi-pump pneumatic, l would strongly suggest the Benjamin 397
http://pyramydair.com/p/benjamin-sheridan-397.shtml