[drail]

Polishing the chamber walls is fine as long as you don't change it dimensionally. Unless it is unusually rough I wouldn't worry about it very much. Most feeding issues are actually caused by magazine issues, extractor finish and tension (very important), breechface roughness (machining ridges left in) or, the number one cause, out of spec ammo (too long or too short). One area of the chamber I always look at critically is the small bevel at the top of the opening (the top rear of the barrel hood). A cartridge feeding from the mag will hit this bevel at an angle and then break over and straighten before it goes in. Some barrels have a nice smooth bevel and some have almost none and the surface is very rough. It WILL cause problems for SWC ammo. But before you start polishing anything have a knowledgeable smith (unless you are one) give the gun a thorough checkout and find any feed problems. The extractor is a big problem on very many production guns. So is the magazine's release point and how high it sits in the gun. If you have a match barrel fitted you may have to have a finishing reamer run into the chamber. Most barrel manufacturers leave the chamber a little short so the smith can custom ream it for the ammo that will be used. Just a few thousandths short can make all the difference. Your handloads should drop all the way in and fall back out under their own weight when you tip the barrel up.