I spoke with Lee today and told them I was having issues with neck tension on some of my loads. The mandrel in ever one of my dies is -.002 less than the caliber. The bullet is seated well but you can push it in if you want by hand. I did a test with loaded rounds in the magazine and one of the rounds in my .257 WB pulled out some. I have used the factory crimp dies and they tear up the case. It needs to be trimmed alot everytime. I got away from using them and I am just concerned with the bullets staying put when in my pack or magazine. I loaded some Bergers today and have spotty tension. I read an article on this site by Jerry Teo that said Lee dies will give you "that 4-5 thousandths of neck tension you need'. So I took the mandrel out of my .280 die and honed it down from .282 to .280. This obviously gives me 4 thousandths neck tension. I cannot move the bullet by hand. This is the same kind of tension I have experienced on factory amo that is crimped in a canelure. Lee said I could hone the die down for more tension but said I should use the crimp die. Seems to me honing it down does the same thing but keeps your brass in better shape. Any feedback??? What do you guys use for neck tension?