25 Gibbs Rifle cartridge

krypto

Senior Refuge Member
Joined
Feb 6, 2001
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Collinsville, IL, USA
I have a Winchester model 70 rifle chambered for a 25 Gibbs rifle cartridge. It is a 30-06 shell case necked down to 25 caliber and fire formed to form the shoulder angle. The only information I have about this gun is that the cartridge was designed by a person in Utah possibly in the 1950s. Does anyone have any loading information about this cartridge?
 

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