Small question with a large answer
Google…….
Internal ballistics
External ballistics
And terminal ballistics
And have a good read of all the headings that comprise internal ballistics
From primer through to muzzle it’s a complex list that in its entirety affects the muzzles release of the projectile, and from there you enter the subject of external ballistics
Fortunately with the ammunition itself we can modify component choices and settings until they work with the rest of the rifle to produce what we want, (consistent and repeatable near identical velocity and barrel harmonics until projectile release)
It’s no one component, it’s the sum total of everything
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