Ok Had a measure up
Norma 300SAUM brass neck wall thickness 0.0155"
Norma 300SAUM brass neck sized to 7SAUM 0.0160"
Norma 300SAUM brass neck sized to 7 SAUM with 180 berger 0.3155"
Redding Bush size used was .314
Projectile seated using Forster Benchrest seating die
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