Go to the CROSMAN homepage and click on "find a repair center" it will help you find a repair center that handles your rifle See the related link.
I would search the web for "Air gun repair" or see the link below.
There are three different versions of the 766 but all three load the same. All load through the oval trap door on the pistol grip. See the link below for the Owners Manual
It depends on the model and the caliber of the Pellet gun.
I think you mean CROSMAN not GROSMAN. To contact Crosman simply go to there home page and click on "Contact Us" at the bottom. See the link below.
I think you mean pellet gun. That is a gun that fires a small lead pellet but does not use gun powder. It uses compressed air or compressed gasses to push the pellet.
A pellet gun is not adequate for protection, and will get you arrested.
It all depends on the model and who made the pellet gun. I suggest that you re-post the queston with the model and make of the pellet gun to get an answer.
Any pellet gun should be handled like a real firearm. Yes you can be killed with a pellet gun under the right circumstances.
No. Even if it would fit in the chamber, there is no firing pin on a pellet gun.
Nope. Pellet guns are fairly safe to use.
Are you asking about a Benjamin model 177. If so, then never more than 10 times or it will blow and ruin the seals.
No. A pellet gun would use compressed air.