Did a test today on a .308 for poi change with new and used brass on a fl die, half with expander ball, and half without found here . One thing I realized is that when sizing without the expander ball the inside of the neck measured .295, and with the expander ball it measured .300. If you read the link I posted you will see that at 200y there was no difference in POI. Is .295 too much neck tension to be seating bullets into? I would rather not use the expander ball cause its a pain in the ass forcing cases through it. I read somewhere on here that brass doesn't allow more than a .3 tension, but I feel like trying to seat the bullet when its at .295 might ruin the bullet going in.