Quote:
Originally Posted by Pistolgripshotty
The longer the barrel the more velocity...its simple physics.
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Simple physics that turns out to not be true.
The powder eventually stops creating more pressure than the bullet/barrel friction.
Some cartridges (typical handguns) this number can be as low as 12-15 inches. 22 rifles might be around 16-18 inches. Many small capacity rifle cartridges might stop gaining speed around 22-24 inches.
No reason shotguns would be different. Longer does not always mean faster.