He's got a butt load of pictures for assembly and dis-assembly. I'm not sure but there might be something in there about the feed ramp. I know from asking around about it myself, you want to make sure you don't overdo it. Could cause problems.
With regards to the SA XDs, there is absolutely no reason to polish the feedramp, hood, or throat unless you are having problems. This procedure is a requirement however in less reliable guns, the Kel Tec P-3AT .380 is one example. It does make a difference in terms of reliability. Easy enough to do with a Dremel, felt tip, and polishing compound.
Here are my before & after pics. I apologize for the poor quality.
I was having trouble feeding gold dots where the nose would stick on the ramp and jam the slide. A sharp blow to the back of the slide would usually get it to feed. I could duplicate almost 100% of the time if I dropped the slide slowly by hand (otherwise it was only every few mags).
So I tried to polish with a dremel and polising compound. This did not work well because the tooling marks were a little to deep to remove with the polishing wheel. So I changes tactics.
So I used 600 grit wet abrasvie wrapped on a dowel to remove the majority of the tooling marks on the ramp. This was used inline with the bore (90degrees to the tooling marks) and I took care not to remove material where the ramp meets the chamber.
I followed with the dremel polishing bits and then a polishing wheel with polishing compound.
Now the ramp is polished like a mirror and no matter how slow I drop the slide it feeds 100% of the time and have had no feed failures since.
Really you dont even need to remove the tooling marks, polishing with a felt wheel and rouge will make it look like a mirror which is normaly sufficient. I would not use sandpaper in my chamber, this can open up the chamber dimensions and could lead to higher pressures and ruin accuracy. Match chambers are very tight for a reason, you have to have find a compromise between function and performance.
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