Originally Posted by morrow
I wouldn't do that. The Dillon powder bar has a tefflon coating on it. All you're doing is removing the tefflon coating thus adding more friction and play when the bar moves during operation.
I haven't bought one in over 10 years, have 12 different measures and toolhead setups. All of mine are plain aluminum and I used fine steel wool to clean them up to satin smooth, all worked better than original finish. No discernible amount of metal was removed.
If the newer ones are teflon coated then I would agree with not polishing the bar itself.