If you are talking about a PCP (PreCharged Pneumatic) rifle. With a .45 caliber pellet, then "Yes" It can. I don't believe there is a 40 Caliber pellet gun.
It may be possible- but a .22 caliber pellet rifle will not RELIABLY kill a deer, and it is probably not legal in your area. A .22 pellet simply does not have the energy to damage nerves and organs to produce a quick and humane kill. .22 rimfire rifles have been used to kill deer, frequently by poachers. However, there have been many more deer wounded by .22s that would die much later from an infection. While it may be possible, it is not a good idea, and definitely not sportsmanlike hunting.
No BB guns are not powerful enough to kill a deer. However they do make a pellet rifle that will kill a deer or other large game. these pellet rifles are in the PreCharged Pneumatic class of airguns (PCP). the require 2000 to 3000 PSI to charge them. A special hand pump or a scuba tank is required to fill the air chamber in the rifle. A BB is a .175 caliber projectile. PCP air rifles can fire a 45 or 50 Caliber pellet. The pellet is about as large around as a mans thumbnail. It will bring down a deer, boar or moose.
If you are talking about a .177 caliber pellet. Most likely the answer is NO. But if you are talking about a 45 caliber or 50 caliber pellet then the answer is Yes. Pellet guns come in .177, .20, .22, .25, 9MM, 45 cal and 50 Caliber. The last 3 sizes are fired by PCP air rifles (Recharged pneumatic ) that require a scuba tank to charge them to 3000 PSI. They are still pellet rifles just the BIG BOY of pellet rifles.
It could do it, although it wouldn't be the most "graceful" means of accomplishing it.
Yes, there are several pre-charged, and break action pellet rifles that can more then kill a deer. They even use them to kill Wolf and Coyotes. However, you'd need a rifle with 16+ foot pounds to reliably kill large animals.
It depends on what you mean. If you mean legally, many U.S. states require a caliber larger than .22 or 223, however, that IS legal in some states. If you mean what caliber will kill a deer, almost any rifle caliber will, but .22 or .223 is questionable, which is why many states prohibit that for deer hunting.
Any caliber can do the job. Most states regulate what can be used.
No... Corrected answer.-------------- It depends on the caliber and power of your Pellet gun. But Yes it is possible. In fact many pellet guns and rifles are used for rodent control.
About 1" past the muzzle.
No! And for those that think the bear will ignore it I'll just say this. If you are OUT OF YOUR MIND and use a pellet gun then the bear WILL NOT, I REPEAT, WILL NOT IGNORE IT! IT WILL ATTACK! Therfore the only out come is it will charge you while you are reloading your precious single-shot pellet gun and will have you for supper. If you are hunting deer or elk with a pellet gun then you can kill one because there are high-powerd pellet guns out there that are proven to kill medium game...BUT NOT LARGE GAME!
This question depends on the bullet, trajectory, and placement. Personally, I would never take a .223 caliber rifle against a deer. It does not have the penetration or mass of the bullet to make a good shot. Now back to the question, yes it could but it is highly unrecommended. Technically, a 22lr could kill a deer, but that is a less that 0.05% chance! Use a .308 or 30-06 caliber rifle!