I've done it on a SigP230 (it was a pain in the but since it's a blowback with the barrel mounted to the frame) with great effect. It was a used gun that wasn't feeding very well, so I polished the ramp with a dremel and an exceedingly fine polishing point. Also EVER SO SLIGHTLY throated the barrel (really just polished the throat). Followed up with jewelers rouge and elbow grease. Now it feeds perfectly.
The key is to take it slow, use a dremel, figure out what grit abrasive you want to use and go one level finer. Take off too much material and you can cause more prolems than you fix.