In THEORY, any bullet MAY kill a bear. However, I would look for a firearm in the power range of a .308 at a minimum- 30-06 or .300 Win Mag would be better. A shotgun loaded with slugs (12g) would also be a good choice at close range. Handguns would start at .44 magnum, and go up.
Yes, any bullet of any caliber can be lethal.
It will kill someone
It depends on the bullet and its kinetic energy, 50 caliber certainly can.
It's a .30 caliber bullet.
A 22 caliber bullet is 22/100 inches in diameter. A 7.62 mm bullet is 30 caliber or 30/100 inches in diameter there is no such thing as a 7.62 caliber bullet
caliber 38 is a caliber 38. bullet dia. is .357 caliber deals with the dia. or measurement around the bullet head, not the bullet case.
It all depends on the hit. Some hits, it can. Others, it won't.
The .22 caliber bullet is ABOUT .22 inches wide. A .32 bullet is about .32 inches wide. The bullet will also be heavier due to size.
bullet
The highest caliber bullet commonly used is a .50 cal. However, there are bullet that are larger in caliber. the 700 Nitro express comes to mind.
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!
If you mean a .40 caliber bullet in a .32 caliber gun- no. The bullet would be 8 thousandths of inch too large to fit in the gun. Caliber refers to the diameter of the bullet, so a .40 caliber bullet is ABOUT .40 inches across, and a .32 bullet ABOUT .32 inches across.