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Barrel shank question

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Hi guys:

I've learned more terminology. Per a previous post, I've been wondering about custom barrels.

One specific question I have is what determines the barrel shank's length (chamber end)? I've seen some barrel profiles with it at 3". Others at 5". Does it matter?



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hmmm i have noooooo i dea... 


the only things im thinking about are it shouldnt really matter?  i turned a barrel OD down for a 3-4'' gas system shortening, and it takes aloooooootta meat off it back to near where the forcing cone is.  folks do it, so i assume it doesnt impart "grenade" characteristics

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Pressure is greatest at the chamber, and decreases as the bullet travels down the barrel increasing the volume that the gas has to expand into.  I would be hesitant to turn a barrel down too close to the chamber.

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