Where do snipers tend to aim when they are going for a kill? Are they more inclined to aim for the head or do they take the easier shot and try for the heart?
Usually, above the target, and ahead of them if they’re moving.
We’ve talked about bullet drop before, but the basic concept is that the bullet is a physical object, and affected by gravity. The scope will be zeroed to a specific distance. For example, it might be zeroed for 50m, 200m, whatever. If you’re aiming at ranges closer than that, the scope will be slightly too low, if it’s beyond that range, the scope will be calibrated too high. In either case, a sniper can adjust, and this is the entire purpose of the striations in a rifle scope. These will represent the drop over a fixed distance. Combine that with a rangefinder (if the range is not known), and an experienced sniper will, likely, be aiming over their target’s head at long ranges.
How much the bullet will drop depends on the cartridge and rifle being used. This is part of why snipers are very possessive of their rifles.
This creates a situation where, at long ranges, even if you know the exact range, it is safer to go for a body shot if the option is there.
The second part of where they aim is “leading” the target. Again, a bullet is a physical object, and while it’s moving very fast, it’s still going to take time to travel to the target. If the target is moving the sniper needs to account for that and aim where the target’s path will intersect with the bullet, rather than aiming for where the target is currently.
Additionally, wind and other factors can affect the bullet’s flight path, particularly at longer ranges, meaning that the sniper needs to account for those as well.
So, where do they aim? Not at the target. They’re aiming somewhere in the general vicinity of the target, based on the physics involved.
As for where they want the bullet to connect? Headshots are flashy, but center of mass shots are far more reliable. At that point, it’s a personal choice by the shooter, which they’re going for.