My 91/30 extraction problem a couple years ago was due to a burr in the chamber. After firing new Lapua brass I had to use a piece of wood to get the bolt to open. Upon scrutiny of the fired brass I determined that slight gouge and weird scrape was NOT on the brass when it left the factory. A second firing verified this. The rifle sat for over a year until I had a spare few hours one weekend. Chucked up an extra long screw driver extension wrapped with fine grit sandpaper (but it wasn't sand...something else). Once I determined where the burr was it only took a minute to smooth out. There is still a slight indication of the burr left on fired brass, but I can live with it. Don't feel comfortable taking off any more of the rifle's chamber, no matter how minute. Might do a chamber cast just to see what I have. - Liam
"Wars are, of course, as a rule to be avoided; but they are far better than certain kinds of peace." - T.R.