IMHO, I would NEVER use a pipe cutter- the pressure that the cutter puts inward as it rotates and cuts will flare the barrel into itself, resulting in a smaller opening at the end.
I have the advantage of being able to use a steel lathe for the job; if you don't have this luxury, I'd use a hacksaw (very gently and patiently) to cut the length. Try to keep your cut as straight as possible. Then use sandpaper and a sharp X-acto knife to remove the burrs and smooth off the end.
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