I would think under both options (shortening, or using higher pressure, cases), you would have to inside neck ream,
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400 GNR - Short?
- Keith, 2026-05-11, 18:42
![[*]](themes/default/images/complete_thread.png "Open whole thread")
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Yes, it’s called the .401 Herters Supermag
- WB, 2026-05-11, 20:55
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No, not quite
- Keith, 2026-05-12, 18:37
- I think the .400" is too big for a .30-30, .225, whatever - WB, 2026-05-13, 13:10
- 401 GNR #2- 445 SM necked down (nm) - Sean Harper, 2026-05-12, 04:34
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No, not quite
- Keith, 2026-05-12, 18:37
- neck ream - AlanT, 2026-05-11, 19:19
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Yes, it’s called the .401 Herters Supermag
- WB, 2026-05-11, 20:55