.375 Kynoch Brass Caliber??

[RangeRangeMaster37]

Trying to determine the correct caliber on the brass pictured?
Overall length is .290 and a straight wall case as you can see and Berdan primed.
Thanks in advance.

 

[Homerange]

A weird one indeed.
Cartridges of the World bible:
Being rimmed and straight walled .375 Flanged Nitro Express matches except for case length of 2.5" and 3.10" COAL.

Whereas to get a length match in rimmed .375 Flanged Magnum is closest at 2.94" case and 3.8 COAL however that's a bottleneck case.
Maybe you can find more info about these from Kynoch ?

 

[RangeRangeMaster37]

A weird one indeed.
Cartridges of the World bible:
Being rimmed and straight walled .375 Flanged Nitro Express matches except for case length of 2.5" and 3.10" COAL.

Whereas to get a length match in rimmed .375 Flanged Magnum is closest at 2.94" case and 3.8 COAL however that's a bottleneck case.
Maybe you can find more info about these from Kynoch ?

Yes, the same information that I found.

 

[Kurz]

Kynoch 375 Flanged Magnum NOS Brass for reloading​

Kynoch 375 Flanged Magnum NOS Brass for reloading​

One box of 25 pieces of 375 Magnum Flanged brass. These are the flanged or rimmed version of the 375 H&H Magnum that were used in some double rifles. All brass is Kynoch brand and headstamped as such. This is new old stock virgin brass and has a Berdan primer pocket. It is in the original Kynoch box.



This is from a completed ad:

Ad for .375 Magnum Flanged brass cases

 

[Dusty Stevens]

They are used for forming the 375 h&h flanged that are used in double rifles

 

[RangeRangeMaster37]

They are used for forming the 375 h&h flanged that are used in double rifles

Well, not so sure about that. Those cases were bottle necked you mentioned. Along with being 2 1/2" in length. These cases are once fired from a rifle as you see them.

 

[Dusty Stevens]

Well, not so sure about that. Those cases were bottle necked you mentioned. Along with being 2 1/2" in length. These cases are once fired from a rifle as you see them.

I see. Weird one indeed to call it a 375 but its not necked to 375

 

[piie]

Could this be someone trying to make a rimmed 458 from the 375 - basically the same way you make the 458 Win-Mag or Lott from the H&H?