My E. Arthur Brown accuracy barrel story is rather convuluted. I bought one from another member on this forum used. He had the barrel made in 6.5/06AI and then sent it to OTT (On Target Technologies) and had Mike rechamber it to 264 Win. Mag. The barrel was in excellent condition when I recieved it but was unhappy at first because I couldn't get even mediocre accuracy from it, but I measured the COL from case had to rifling and the throat is waaaaay looooong in it. I had been trying to shoot 140 grain Hornady Interlock bullets and I found I couldn't get within a quarter inch of the lands so I bought a couple hundred 160 grain Hornady Jacketed Round Nose bullets and seat them out as far as possible which puts them at .010" off the lands. I don't know who reamed the throat so long, or whether it was ordered that way. I am still in the load developement stage but I think it will shoot very well with this cartridge/length setup. I am planning on elk hunting with it next month. BTW, this barrel is nearly free from copper fouling after a fairly long range session with it.