I wrote earlier about a bullet seating problem with 150 gr. .308 TTSX bullets seating at varying depths despite the Lee bullet seating die being in one fixed position. It seems that the bullets are being held in the bullet seating plug in the end of the die and are being obviously or less that obviously pulled out as I draw the cam down after seating. This varies from 3/1000's on an inch to say 4/100's. It is confirmed as I actually worked a completely finished round in and it got pulled out noticeably. I have since adjusted my lowering of the press cam very carefully to avoid this, though I still feel a slight 'click'. It may have something to do with the seater plug ogive and the plastic tip interacting in an unholy way to grip the bullet.
I now measure all rounds for COL to confirm that they are acceptably similar. It seems I need to either get a new bullet seater plug that suits these bullets better or get this one ground out a bit and polished. Any ideas? One idea was to get a spare plug or two from Lee and experiment.
I have adjusted my die correctly backing ti out one full turn before adjusting the seater adjustment down accordingly. So no way near the crimp. And the neck tension seems okay, they are quite solid, certainly not loose, and they shot very well. But it is disconcerting to say the least. I have given all a slight 1/4 turn Lee crimp afterwards.