Relation in between powder weight and barrel length

I believe accuracy nodes are to do with a certain velocity range of a similar weighted bullet. Each barrel length and contour affects harmonics also. I have heard that dwell time (time bullet spends in the barrel while firing) can by used as a metric to predict likely accuracy. I believe the person was using a program called quickload. If you post your rifle barrel and caliber specifics someone will probably give you a load that worked reasonably well for them, but it’s often quite individual to the rifle.
 
I have never heard anything about a relationship between barrel length and powder weight. Not saying it doesn't exist, but its nothing I've ever heard of.
 
Not sure what you mean.

But one premise that is widely accepted (empirically tested) is that for a given load, there will exist a positive correlation between muzzle velocity and barrel length.
I would have to look for it, but I found an article years ago, where an F Class shooter in New Zealand (maybe Australia) took a 308 with about a 28" barrel and used highly consistent reloads.

He measured muzzle velocity at various lengths from 28" to 20" (he actually cut his barrel at the range with a saw).

In a nutshell, it was discovered that there was big increase in velocity (something like 160 fps) from 20" to 26".
But the increase in velocity diminishes after you add inches beyond 26".... basically 28" is still faster than a 26" but not by too much

As for accuracy, you should try different powered loads to see what groups best ... that is true of any rifle of any barrel length
 
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