Why does everyone chop their barrels to an even number length?

I went 19" on my 6mm creed. Couldn't decide between 18 and 20 so I just split the difference.
 
There is more than one way to measure the length of a rifle barrel. The nominal length is just a reference for making an order. Some smiths may not even ask length to cut barrel to, but length to cut off a barrel.

The NIST standard is closed bolt face to crown, or a measurement taken parallel to axis of the bore. I don't know that every manufacturer follows this, especially if they are not even a US company.

If Tikka sells me a 24" barrel, I believe they measure from tenon to crown. There is about a 1" threaded tenon, and 23" of barrel visible from action face to crown. If I want 20" of barrel to the action face, I could ask the smith to cut off 3". The overall length of the barrel per manufacturers reference would then be 21", after cutting. I doubt the bolt face to crown measurement also comes out at exactly 21". I would expect it to be tens of thousands of an inch beyond exactly 21".
 
cause even numbers are good luck. for everything. Radio volume, speedometer, microwave settings...everything works better and gives you better luck is it's even!
 
More food for ponderance..

Why does everyone do whole numbers?!?!?!

My 25 prc is 23.25" 😅

(Or was...its dieing 🫠. Boring me already has a 26" barrel in waiting...she gonna be fast!)
 
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