Thread: Neck tension differences while using a Lee die delux set.

I did some tests out of curiorosity.

So 4 once fired same make cases, same batch.

So std un-sized once fired case, lose on lee neck sizer mandrel, to be expected (case A).

Neck sized another, still a little slack but not as loose...hrmmm (case B).

So I then full case sized another, case neck wont go over lee neck sizer mandrel....so neck now well undersize (case C).

I then full sized a fourth case and neck sized it and its a good slide fit over the neck mandrel (case D)



As an engineer I like case D it feels like I'd except it to feel in terms of fit. However case C is loser than case D, noticably...is this in-consistancy to be expected or is something wrong?



If this is normal and you dont want the projectile sizing the neck (bad karma) then to be consistant you need to full size then neck size, Ive never seen this suggested.

So this is either normal, one of the lee dies is screwed, or Im doing something wrong.



I did this several times and I get the same results each time.

any ideas please?

very tempted to go buy another brand of neck sizing die, very tempted.