Thread: Brass tight in chamber

I am probably making a rookie mistake so hopefully someone here can help me out?

Am loading for a 7saum, using Norma necked down 300saum brass.
Redding full body die.
Am not as disciplined as I should be with my brass, however has been fired approx 6 times?
Currently have some pieces that will chamber fine and others that are exceptionally tight in chamber.

Have compared all dimensions of the brass as best I can, can not identify any significant difference between those that will chamber and those that are tight?

Tried winding down die to bump shoulder back more but no joy.
Thought the neck may be getting a bit thick from repeated firings but on comparison it's hard to see any major difference?

OAL: 2.025
Neck width: .320
Base width: .550
Shoulder width .535
Average neck wall thickness?: .019

Any insight greatly appreciated