I think the best system is the lee collett neck die and the redding body die. That way you can size the neck and the body independantly and only size the body when it's needed.
A full length die with an expander ball can cause inaccuracy because it expands the neck on the way out and it only takes a wobbly stem or inconsistant friction on each side of the neck and then neck is no longer concentric. The redding or lee neck die avoids all this.
For bonus points but the redding competition shell holder set so that when you body size your brass you are only sizing them as much as needed. This also leads to better accuracy as it's a tight fit in the chamber so less likely to be misaligned with the bore.
For hunting ammo I got though and neck size all my brass. Then I chamber it all and body size any that are tight to chamber. Typically this is only about once in every 10 reloads. If more than a few need body sizing I body size the lot.
For range ammo I don't worry unless they were really hard to chamber when I shoot them.
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