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You can do a 2 step.
Run a 1/2" ( or bigger ) out, say 25 to 50 feet. Then, switch to a 3/8 if you like.
I run 3/4" to a 1/2". Uses a lot of air when you are sand blasting, but the results are consistent.
For your average shop, get the 1/2 and not worry about it.
Heck, I think Harbor Freight has them on sale.
Just an additional $0.02
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