Mystery Cartridge, hints wanted.

[BVZ24]

Went to a local show today and had some fun digging through the bins of loose cartridges. Pulled out this cartridge and gave up $1 for it.
Originally thought it was a rare Jager 7.62x54r, possibility WW1 US Reserve issue. Lined up to an identified cartridge, it matches to 54r in most dimensions except shoulder angle. Any hints to what this may be?

https://ibb.co/x2mvJqN
https://ibb.co/58pbFjV

Information

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[browningautorifle]

Here are the pics in clear...

Yes, it looks like a 7.62 x 54 rimmed.

[oldfoneguy]

30-40 Krag/30 US Army? Neck length and shoulder angle match my reloads but the shoulder is different on the original rounds I've collected.
Didn't the U.S. Cartridge Company become Winchester in the 1920's?

[bob q]

A US made 7.62x54r cartridge made for the US made M-91 rifles that stayed in the US . Being a rimmed round the shoulder angle does not mean anything . The 30/40 Krag was never known by metric in the US .

[RCS]

The Russians used the early round nose FMJ 210 gr bullet until replaced in 1908 by the 148 gr spitzer bullet (which took years to replace)

The US Cartridge headstamp on your cartridge has the early Russian round nose bullet

I have a 45-70 case with the US Cartridge headstamp too

Photo shows early Russian pre 1908 cartridges in a clip

[browningautorifle]

I have a 45-70 case with the US Cartridge headstamp too

I have a .30 cal cartridge I picked up in Ft Lewis at an old MG position that's marked to the US Cartridge Co as well, yes they made lots. I wonder if since they were such an early company (1918) they were making this ammo for the Russians on contract?

[Surpmil]

Wasn't aware that the Russians had used a 210 gr. bullet. At 148 gr. they certainly embraced the light bullet philosophy of the time!


That puts the sighting of the early rifles in a different light. Did the rifling change as well?

[Bruce_in_Oz]

&.62 x 54R uses 1:10" twist, as needed to stabilize that long 210gn bullet.

Interestingly, they kept that twist rate for their two other "7.62" cartridges, 7.62 x 25 and 7.62 x 39. Neither of these cartridges, firing their respective "standard" ammo need such a fast twist for stabilization.

However, it meant having ONE pattern of tooling and ONE gauging standard.

Churn out barrel "blanks" by the yard and trim and profile to order.

All three of those cartridges are proven to be no less effective for their lack of "subtlety".

[Lee Enfield]

30-40 Krag/30 US Army? Neck length and shoulder angle match my reloads but the shoulder is different on the original rounds I've collected.
Didn't the U.S. Cartridge Company become Winchester in the 1920's?

I'm sure that I've seen boxes dated into the 1930s.

[RCS]

there are boxes of 30-40 krag cartridges with late headstamps long after the Krags were removed from service. These 30-40 cartridge were
use in sub caliber inserts in large coastal artillery during the 1920 to pre WW2