So for years with my .308, I'd necksize using my Lee Collet die and then FL size around every 5 goes. No dramas.
When I moved to 6.5CM I remember Colin at my local gunshop saying I may experience problems with the Lee Collet die in 6.5CM, with the neck springing back, thinking not a lot more of it, I bought his recommended Hornady neck sizing die (#046043) and stuck it at the back of the reloading drawer, just incase.
Anyway....it happened! So after four very sucessful sizings with my Lee Collect 6.5CM die, I was shocked to discover that when I came to seat bullets, the neck tension varied from "almost normal" to "almost nothing". I tried to understand why, maybe the cases 'sprang back', maybe they needed annealing etc, and never fully came to a conclusion as to what happened.
That left me with a problem of a batch of 4x fired, prepped & primed cases. So I decided to take my Hornady neck sizing die, removed the decapping pin and set about carefully neck sizing my primed cases (this was favoured over depriming them for safety reasons!). I am a little worried the expander mandrel uses the decapping pin to centre itself in the case, and that maybe resizing sans decapping pin I may have introduced some concentricty issues to the neck, but the mandrel looks sturdy and the decapping pin kind of floats anyway?
Anyone have any thoughts on this? I'm keen not to have this happen again. Has anyone seen it before with 6.5CM where the necks dont seem to be sized correctly after using the LCD a few times? (although its been fine til now...the collets are not jammed). Do I need annealing? Or FL sizing sooner?
Was my remedy solution 'acceptable' or would it have been better to decap and FL size the cases?
Any advice appreciated!