Yes
Over a mile.
In excess of a mile.
Something chambered in .50 caliber would be better. But shooting at a mile's distance, success is much more reliant on the shooter's skills, luck and comfort with their tools as the equipment itself.
It is possible.
Accurately? About 100-150 yards. How far can the bullet travel? Fired at a 34 degree angle, about a mile and a half. No accuracy, just total possible travel.
It depends on several factors, but "about a mile" is a good average.
Possible- yes. Likely? No. Most "assault" rifles have a much shorter effective range. Hitting someone at a mile with a relatively low powered rifle would be a matter of chance.
Theoretically possible out to a mile. 200 yds would be stretching it though
in excess of a mile
Possible, but not likely. The drop of a .22 bullet at one mile is so great you would need to aim several hundred feet in the air above him.
Several different air rifles use the .177 caliber pellet. Each different model rifle can propel the pellet a different distance depending on the power plant that the rifle uses. .177 caliber pellets also come in different weights, this also has an effect on how far the pellet will travel. A PCP air rifles (PerCharged Pneumatic) that use a scuba tank to charge them to 3000 PSI can obviously out distance a C02 charged rifle in propelling a pellet. So you can expect a pellet to travel anywhere from a few hundred feet to over a 1/4 mile with ease. Depending on the rifle used.
In excess of a mile.