That depends on the type of bullet, the initial velocity, and the angle at which it is fired. A ballistics calculator is the best way to find the answer.
The 7mm cartridge is fine for deer, but the keep the bullet grain down using a 150grain which is better for deer.
not much
The BULLET drop is the pull of gravity on the bullet as it is shot, resulting in the bullet lowering in altitude over a long distance. This is what long-distance shooters have to account for on their scopes. Different types of bullets with different weights, sizes, and shapes, as well as the barrel length and rifling ratios, affect how much the drop will be.
Depends on muzzle velocity, projectile weight and distance.
1.5 inches
16 feet. Just like anything else dropped on Earth.
If you shoot 150 Grain @ 2800 fps it will drop -10.8 inches if sighted zero at 100 yards.
That is going to vary based on what kind of "300" you are using, what the type and weight of the bullet is, what your initial velocity is, and at what distance you are sighted in for your far zero.
Depends on the loading, and the zeroed range. An 80 grain bullet zeroed at 100 yards will be about 10.2 inches below the line of sight at 300.
If zeroed at 100 yds, the bullet will drop ABOUT 275 inches below the line of sight at 1,000 yards. At that range, large number of variables including the muzzle velocity, air pressure, temperature and humidity.
At 1500 yards a 661gr bullet out of a 29in barrel will drop 967in., out of a 20in. barrel it will drop 1207in. This is according to Barrett on there web page. You will have to convert to meters.
If the rifle is sighted in at 100 yards, at 300 yds the bullet will drop 24-25 inches below the aiming point.