Redding Re-sizing issues?

[N310toN170]

I'm assuming the use of a .223 small base body sizing die may help in this case, any thoughts?

I have a M1S upper that seems to eat most anything and a Noveske that's pretty fickle. I had just always made the assumption that it was due to neck thickness issues.

I'll be keeping a closer eye on this thread, if anyone could chime in on the use of the small base sizing dies.

As always, much appreciated!