ken snyder
Well-Known Member
- Joined
- Jul 26, 2010
- Messages
- 420
As a reply to 80 rounds being too much or not. There are several things involved. As an example: 200 rounds ago I cut my wifes new chamber so that a Sierra MK 190 made contact with the lands on a push feed only 300 WM at a c.o.a.l of 3.5 inches and as of this weekend it makes contact at almost 3.7 inches (.2 inches of errosion in 200 rounds). The second consideration would be the ream diameters and lengths, the origional chamber ream and the second ream, as well as the barrels actual land diameter which can vary as much as .0015 between barrels. It is a misconception that barrels and reams are made to an exact size, they are made to within specifications and then only to the manufacturers experience and criteria. In my opinion it is 100% necessary to cut the chamber end down far enough to get to as clean and virgin of metal as reguired to get past the majority of land ( throat errosion) as practical and more than necessary to get past the work hardened and impregnated metal. Your photos of your brass looked visually horrible but your chamber isn't so bad that it can't be polished out to a better degree of acceptability or once again rechambered if there is enough barrel left. It hurts but barrels are the disposable part of the rifle and some of us replace barrels as often as our pocket book will allow.