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I've had much better results from polishing the breechface than the feedramp. The bullets essentially bounce off the frame when shooting, rather than sliding along the surface, so the angle and shape is more important than the surface finish. Also, assuming the shape and angle are correct (not always a valid assumption, unfortunately), do not remove any more material than necessary to clean-up major tool marks. Do not polish an aluminum frame, as it will remove the protective coating; the bare aluminum will not hold up to the sharp, hard edges of hollowpoint bullets.
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