What determines a bullet's grouping?

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Factors influencing bullet impact beyond recoil, unsteady hands, and gravity include air conditions like wind, ammunition imperfections, and temperature effects on the weapon. While gravity affects all bullets equally, velocity is crucial for accuracy as it allows bullets to travel further before being influenced by external factors. Higher velocity results in shorter flight times, minimizing the impact of air resistance and gravitational drop. This means that faster bullets are less likely to be diverted from their intended path. Understanding these dynamics is essential for improving shooting precision.
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What, other than recoil, the user's unsteady hands and gravity, causes bullets to impact different places on the target?
 
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Things which might influence the bullet:
- Air conditions (wind, ...)
- Imperfections in the ammunition
- maybe the temperature in the weapon (as it can expand parts of it), which can increase during its use

Gravity should be the same for all bullets.
 
Why is velocity often said to increase accuracy? Because it can go further before being blown off course or dropped?
 
Higher velocity -> shorter flight time for the same distance.
It reduces the time for air and gravity (and probably other effects) to modify the path.
 
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