A good eye and a file would do it. We're only talking about removing 18 thou here anyway, on kuduae's figures. Good occupational therapy in front of the telly! The penalty for slightly out-of-round rims is nothing in real terms.
Chucking the case-neck in a drill press (or even a power-drill) on a mandrel (seated projectile?) could speed-up the process and reduce errors, but with the case body unsupported one would need to be gentle with file pressure.
Of course a lathe is better...
-------------------- Marrakai
When the bull drops, the bullshit stops!
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www.marrakai-adventure.com.au
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