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Ok so I annealed the cases. First time I've done it definaltely got the first one a bit hot. Just used my drill and a Map gas Turbo torch.
I only did 5. When they cooled went and sized them with Lee Collet die. Felt a little better. But the most obvious thing was the case was slight sucking on the decapping mandrel on the way out. So it does appear the brass had work hardened and annealing seemed to have fixed it to some degree.
Now for the rest test...
So I seated Speer 52 gr HP in the case. Same problem! I can push the projectile with my fingers. Far out!
I run one of the annealed case through the Hornady neck sizer. Seems good. Projectile is gripped pretty well.
I've never had this problem before. So I used the Lee a Collet die to resize the other 3 case and seated a 50gr Zmax and 55gr Sierra super roo which was were both held snugly in the case. For good measure I seated a Flat base Hornady Roo Max! No problems can't move it with finger pressure
Whatever is going on its only happening with 52gr Speer projectiles. Everything else is working the same. Just as it has in the past for me.
I dunno. The Speer 52gr definaltely appear slightly bigger at the base. Maybe the collet is putting a slight taper on the neck when it sizes it and when I push the Speer projectile into the neck it is opening up. Maybe the Hornady die is working because it is kind of doing the opposite. The neck might be tighter closer to the shoulder of the case. Because the expander is getting pulled back through it.
Still confused. Thanks for the ideas so far. I really appreciate it.