Sounds like the final 2 are due to something else, but you weren't really specific enough.
There CAN be a capacity difference in ANY brass, but.....
In my 308 class cases(243+) and larger I have never noticed a difference.
My 308 1K loads are a hodg-podge of brass. All neck sized, but the load is MOA as long as the gun isn't hot, or I can't read the wind.
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