What could it be?

[MOA]

Time to ask the community what this rifle brass was altered to shoot in. I know it's one of those geez.....could be anything and if there is no answer to be found so be it, no biggy, they were free. Base is stamped 30-40 krag. Rim has been turned down to .477 or .478 with a case length of 2.257 or 2.258 and a base of .4205, now these are measurments from fired shells. The case mouth measurement averages .367 to .368.

Here are images:

https://i.postimg.cc/qRYtFKHq/20220208-104305-1.jpg (https://postimg.cc/bDxNDsJf)

https://i.postimg.cc/1zvVpTWp/20220208-104344-1.jpg (https://postimg.cc/sBZ2znCX)

https://i.postimg.cc/76bGXVcj/20220208-104352-1.jpg (https://postimg.cc/hzWtt9K0)

[cwtebay]

I believe that is a 40-40 Krag, or 405 Krag.
Basically a short 405 WCF.

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[Tracy]

Neck diameter, assuming inside diameter, sounds like a 9.3mm of some sort.
Lots of assumptions in this post. The picture tells me you meant .30-40, not 40-30 although that would have been a good assumption since you said "krag."
I also assume "base of .4205" refers to the case diameter and "Base has been turned down to .477 or .478" refers to the rim. I guess we could assume that "case length of .2257 or .2258" actually means 2.257 or 2.258 inches, since as written it would have to be cut off just ahead of the rim and we can see from the pic that isn't the case.

Sounds to me like a 9.3x57R aka 360 Express.

[cwtebay]

I was actually going off of the appearance of the lack of taper to the case to arrive at my presumptions.
Perhaps in spite of the measurements.

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[MOA]

Neck diameter, assuming inside diameter, sounds like a 9.3mm of some sort.
Lots of assumptions in this post. The picture tells me you meant .30-40, not 40-30 although that would have been a good assumption since you said "krag."
I also assume "base of .4205" refers to the case diameter and "Base has been turned down to .477 or .478" refers to the rim. I guess we could assume that "case length of .2257 or .2258" actually means 2.257 or 2.258 inches, since as written it would have to be cut off just ahead of the rim and we can see from the pic that isn't the case.

Sounds to me like a 9.3x57R aka 360 Express.

Tracy...all correct. Love those who can read between the lines. Correction made. Thx.
Yes, these were 30-40 krag at one time. Seems like a straight walled 35 caliber rifle. I'm digging into this mystery. Hope more will put in their thoughts.

Not a 9.3 x74R, cause I shoot that chambering.

[MOA]

After going through a few books I think this might be the mystery chambering.

https://i.postimg.cc/8cpP4841/20220208-131536-1.jpg (https://postimg.cc/34qTrcz6)

Thoughts???

[Jedman]

Are you sure the base ( head diameter ) is .4205 ? That is at least .032 smaller than 30-40 Krag brass and I don’t see how someone got it down to that size ?

Jedman

[Nobade]

I don't have a drawing in front of me but what about 38-50 Remington?

[MOA]

Are you sure the base ( head diameter ) is .4205 ? That is at least .032 smaller than 30-40 Krag brass and I don’t see how someone got it down to that size ?

Jedman

Here's another look. Rim was turned and it seems so was the base (head).

https://i.postimg.cc/MH0CHvJ5/20220208-165035-1.jpg (https://postimg.cc/fSL2gWLS)

<a href="https://postimg.cc/6T5mQc06" target="_blank"><img src="https://i.postimg.cc/6T5mQc06/20220208-165021-1.jpg" alt="20220208-165021-1"/></a>

https://i.postimg.cc/85vQ8Zyq/20220208-164815-1.jpg (https://postimg.cc/0M9HD01f)

https://i.postimg.cc/SQWFDtY9/20220208-165021-1.jpg (https://postimg.cc/6T5mQc06)

Of all the books I've gone through, considering these are fired, but since the fired primers are still in the case and the mouth of the case is likely close to the chamber diamensions after release of the boolit which most likely was a lead 250 grain pill.

[country gent]

I dont have dimensions in front of me either but I believe was used to form 38-55 rem cases. 40-70 sharps straight all so but your necks are to small for a 40 cal

[Mk42gunner]

Looks to me like there are a few cases close to a head separation, unless it is the picture making that shing line about an eighth of an inch from the base.

Maybe the diameter was thinned too much?

Robert

[MOA]

By the looks of the specs on 38-50 Remington it's rim diameter at .535 is to big. These cases would drop right on through.

https://i.postimg.cc/Vv7FK8q1/20220208-171213-1.jpg (https://postimg.cc/QKT5MvYn)

[country gent]

The handloaders manual of cartridge conversions shows 38-50 rem from 30-40 krag brass

Length 2.23
head dia .454
rim dia .535
neck dia .392
Body angle deg side .82
loaded length 3.07
rim thickness .065
Case capacity grns of water 60.92

[MOA]

Looks to me like there are a few cases close to a head separation, unless it is the picture making that shing line about an eighth of an inch from the base.

Maybe the diameter was thinned too much?

Robert

No case separation. If you look at a krag you'll see a extractor groove near the rim on the base. It appears the case was turned down to the same level as the groove was. I'm thinking this was shot in a falling block or roller with black likely. A 36 caliber of 250 grains.

https://i.postimg.cc/B6mD0CXB/20220208-173110.jpg (https://postimg.cc/ZBy0PpPW)

If you look close at the base you will see turning tool marks. I'm thinking whoever did the conversion work was not new to turning metal on a lathe either. Tomorrow these are going into the S/S tumbler and a good look over.

[MOA]

Correct. Head measurement too large.

https://i.postimg.cc/Dwhq1mks/20220208-174157-1.jpg (https://postimg.cc/qzmhTJ7M)

[samari46]

375 rimmed 2.25" ??. Frank

[MOA]

Was able to locate the prior owner of the brass. It was the 360 Nitro Express 2.25 that was used in a lever action shooting black.
Thanks all for the time and thoughts.

[ipopum]

That was interesting

[Travisbishop]

I was gonna say, that looked a lot like the .405 Win.