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Suggest you Google it. Was a guy on YouTube trying to persuade the world of the practice. IIRC there have been proponents on this forum. Basically the die compresses the neck in too far so that the button then brings it back out to correct SAMMI internal dia. Works the brass a lot. But not using button gives stronger neck tension. Prob best for boat tail bullets. Fb would prob need flaring of the neck like cast does. Lyman M Die does this at the premium end.
Hunt safe, look after the bush & plug more pests. The greatest invention in the history of man is beer. https://youtu.be/2v3QrUvYj-Y
A bit more bang is better.
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