Re: Polishing a 1911 feed ramp?
I would be very reluctant to take any power tools to a gun, even though I mostly know what I'm doing and have otherwise had no issues with fitting parts. The chamber area must be within a fairly narrow set of specs for reliable feeding. I also second the comments about breech face, extractor tension and prep, magazines, and feed geometry all being important.
Most 1911s with feed issues are NOT related to the frame ramp not being a "mirror" polish. It does not need to be that smooth for reliable feeding. If it did, the gun would never run when dirty. Many people think that the only way to get a 1911 to feed is to polish the ramp, but in most cases, this is a band-aid for geometry issues that are not easily corrected with a dremel tool. If the feed ramp is already at the wrong angle, polishing may decrease the issues, but if the underlying problem is a geometry and/or magazine (or extractor) issue, no amount of polishing will make it run 100%.
Also, if this is a factory gun with a warranty, I highly recommend that you take advantage of that, instead of trying to fix it yourself, because if they screw it up, they will fix it at their expense. If you destroy the frame of your gun, fixing it will be very costly and involve replacing at least the frame, if not the barrel as well.
I also second getting that book. It's a great book.