Just picked up the rifle yesterday. It seems to be headspaced perfectly - it takes a little umph to close the bolt on a resized & empty regular .280 case. I put together some loads for fireforming last night. I need to slap a temporary scope on rifle, and I will be set for shooting this weekend. I plan to use the fireforming session to break in the barrel (regular cleaning during the course of fire) and hope to get into some real load development soon. I am anxious to see what this baby can do.