The size difference is moot due to the belt. For hunting loads tuning neck tension has usually not helped accuracy that much for me it does for others. Concentricity is number one and for hunting loads I go to the Lee Collet dies before bushing dies as they are inexpensive and simple and they work.
But the competition dies if set up well do produce concentric loads. The bullet seater can be a source of alignment woes and the types that support the bullet like the competition seaters usually hold run out to a minimum. But anymore I just don't worry about that last quarter to eighth inch of accuracy. I have become the load and go type.
"When you disarm the people, you commence to offend them and show that you distrust them either through cowardice or lack of confidence, and both of these opinions generate hatred." Niccolo Machiavelli
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