The Redding 300-221 I have makes in-spec 300 AAC BLACKOUT brass. So it is likely yours does also.
Forster and Lee are the only ones correctly marked (Midway will have the Lee).
Hornady 300 Whisper(R) dies from SSK Industries make in-spec brass - at least the set I have does.
My impression of them is - I am not sure which have the least runout but the Forster make brass closer to max size which will make the brass last longer and has the potential to be more accurate and is probably the best choice for bolt guns. My Redding makes brass more in the center of the spec - which is like Remington factory brass which fits my philosophy for ARs.
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R&D for AAC
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