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Andover Arms
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Help Identifying a 25 Caliber case
Sep 19th, 2025 at 1:01pm
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I have an unknown (to me) .25 caliber case I am trying to identify. In the photo there is a new 25-20 SS Jamison case on the left and the case in question on the right for comparison. It is converted from .357 Maximum but I suspect .357 mag and maybe others would work too. ~ dimensions are OAL 1.595, Rim Dia .434, Base Dia .377, ID at the mouth .256 and OD at the mouth .283. Any information appreciated (and I have checked all the books I have without luck)
  
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bpjack
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Re: Help Identifying a 25 Caliber case
Reply #1 - Sep 19th, 2025 at 1:40pm
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Maybe a 25 RKS?  I think Dave Patterson has mentioned this caliber.
  
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Otony
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Re: Help Identifying a 25 Caliber case
Reply #2 - Sep 19th, 2025 at 1:45pm
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That looks very much like a .22 Remington Jet necked up to .25 caliber.
  
Otony
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