From Mark and Sam After Work on YouTube. Just a general guideline but useful I thought.
Approximate Optimum Barrel Lengths
Up to 40 grains of powder
20"-24" inches
40-60 grains of powder
24"-26" inches
60-80 grains
26"-28 inches
80-100 grains
28"-30" inches
100 grains +
30" +
This is only a general guide for the center fire rifle for precision long range shooting.
https://www.youtube.com/watch?v=vimqlc5SUtY&t=15s
Quick Load is also very useful for this sort of calculation as you can estimate velocity effects based upon different barrel lengths and powder burn rates.
-Tutt
Optimum Barrel Length Guidelines
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CowboyTutt
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Optimum Barrel Length Guidelines
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