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Old October 1, 2020, 07:15 PM   #1
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Join Date: December 5, 2019
Posts: 769
RCBS neck expander die vs Lyman M Die

Has anyone used both the RCBS neck expander die and the Lyman M Die? I want to know which is better.

The RCBS plugs act like a mandrel and expands the neck to .001" in some cases and puts a slight flare at the the mouth.

The Lyman M Die acts like a double mandrel and expands the case neck to a certain diameter and then then expands a segment of the mouth further so the bullet will seat in it and direct the bullet straight into the case. My concern is that a cast bullet can be swaged more than desired compared to the RCBS expander plugs.

Has anyone used both and compared the groups?
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