Quoted: Does barrel length come into play at all?
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Technically, yes it does, but its nothing that you need to consider with a battle rifle...
If your building a target/competition rifle, then you would want to do some home work before doing your build...
The length of the rifle barrel has a direct influence on the velocity obtained from the cartridge for which it is chambered along with maintaining minimal "whip"... By selecting the correct barrel length, weight and twist ratio you can fine tune the way the bullet exits the muzzle to create the perfect barrel needed for SUB-MOA accuracy...
A barrel with a faster twist will cause the bullet to exit the barrel earlier than a bullet launched from a slower twist barrel...
AVERAGE VELOCITY BULLET... Possibly the sweet spot occurs when the bullet, with the average velocity, for a particular load, exits the barrel just before the peak of its upward swing…
FASTER BULLET... A faster bullet will exit the barrel earlier and exit slightly before the average velocity bullet and the angle of the upward swing of the barrel will be slightly less. So the bullet's launch angle is slightly less, but the bullet is going faster and drops less…
SLOWER BULLET... A slower bullet will exit later and the barrel's vertical swing will be higher and at a steeper angle when the slower bullet exits. The bullet is launched at a higher angle but is slower and will drop slightly more…
The harmonics of a barrel when being fired will cause the bullet to have an upward swing when exiting the barrel...An average velocity bullet will exit the barrel just before the peak of its upward swing. A faster bullet will exit the barrel earlier and exit slightly before an average velocity bullet thus the angle of the upward swing of the barrel will be slightly less, causing the bullets launch angle to be less also, but the bullet is going faster and drops less... A slower bullet will exit later and the barrels upward swing will be higher and at a steeper angle when the bullet exits the barrel... The bullet is launched at a higher angle but is slower and will drop slightly more...