It could be common for me to have changed my seating +10-times over the course of a 1000-rounds, to maintain accuracy levels that I need and strive for. With many calibers, I wouldn't even expect 1000 rounds of "accuracy barrel life" from them. For myself, checking throat erosion, chasing the seating, and testing seating depths is a continuous on going process over the extent of a barrels life.
Donovan
Sorry Donovan I was joking with Comagutsa about the 1000 rnd thing as he beat me at our last local match..
I agree with your post above as I also check/chase lands after every shoot on both of my target guns.
Cheers Rushty