I started shooting my 30-06 Ackley last November 2007. It's has a 26" SS Lilja barrel. My primer count indicated I've put about 700 rounds through it. I've got a great 180 BT/AB load and am currently working on a 200 AB/PT load for Alaska Brownie/Grizzly/Dall. In the process of determing my Partitions distance to the lands, I decided I better see if/how much throat erosion I had. I looked at the original 180 BT/AB data since this is the original bullet I started with. I pulled the original 180 AB from it's primerless case after I remeasured it and compared the measurement w/ the data written on the side of the case. I then ran the same bullet through my process of determing OAL up against the lands. I reseated the bullet to the new OAL and HOLY COW! If I did my measurements and math correctly I've lost .13" in throat. I went back and double checked both the "before" OAL and Length to bearing surface (LtBS), then compared them both to the new OAL and LtBS;----.13"-----. Is this normal? I figured I might get .02 to .04" but not a tenth plus.