I have done this countless times (resulting in perfect ammo.) ANY neck sizing die for a similar length cartridge (in 416-Rem, Wby, et. al.) will work on the Rigby! (It only engages/works the neck, NOT the body of the cartridge.) You could even use a shorter 416 neck sizing die, it simply must have enough thread to hold it in place (as it will be backed out a bit for the longer Rigby.) GL! Enjoy.
I saw you were looking for some Swift A-Frames for your 9.3. I just bought a bulk supply of them in the 285g. version. If Toby's are gone, I could let 100 go for $200 shipped you are interested.
Thanks,
Gary
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