Search:

Ruger, remmington,sako and tikka are all hammer forged including the chamber I think ruger have got a video of the process being done.

If your doing that look at hammer forged, button and cut rifled barrels, you'll note different finishes and why some are more prone to fouling then others. Quality of a reamed chamber comes down to...

kero, rag, 3000micron diamond lapping paste and ten minutes work to remove all the sharp edges. It's the hand held version of lead lapping but taking twice as long.