I believe they use Wilson barrels that have been profiled and chambered by Frank White at Compass Lake in Florida. I use White Oak barrels a lot. If you do everything else right on your rifle build the difference between the White Oak barrel and a Krieger is 1/2" groups under ideal conditions versus 1/4" groups, again under ideal conditions. If you shoot high master scores in the high power game you can appreciate the difference (3-5 points in a 600 point match).
I believe the chamber is basically a Wylde design.
Myself or my son shoot a service rifle match barrel, an SPR barrel and a 16" recce barrel. The recce and the SPR are in Iraq as I write this.
These barrels clean up well, and our three have proved to be very accurate.
I hope this feedback helps your decision making process.
Good luck,
lawndart