Old Mauser ''New'' cartridge ???

[Harter66]

The story. I bought a pig in a poke .I knew I was getting a German 98, hoping for 7x57 w/the bbl stamped 7mm . What I got was a 1916 DWM Berlin. The bolt face is opened to .500 + a 30-30 fits pretty good. I fire formed an 270 case w/Unique and COW and this is what came out.

Over all 2.451
Head to neck base 2.050
Head to shoulder base 2.000
Fire form neck dia .330
Fire form shoulder dia .460
Base@.3 above the head .473
Typical 7mm bore .278 x .284

Is it a 280 AI chamber ? Could it be so simple85469

[Harter66]

06' case for comparison.

[tomme boy]

280 Ackley Imp. ???

[Harter66]

It sure looks like it. Its a little short but it wasn't hard close forming.
I'm pretty excited . It looks like the neck is a little long to but better for cast and PP's.

[texassako]

Sure looks to be a .280 Improved. Shoulder diameter looks a little bigger than the numbers I have for Ackley's. I wonder why the bolt face is opened up that big? It is big enough for a .284 Win case.

[gew98]

The bolt may be from a wehrmannsgewehr - basically pretty close to the 32 win spl/30-30 win. You can make brass out of those US calibers for the 8,15x46 pretty much by fireforming.
What are the markings on the bolt ? . I ask as it may be worth more to a collector if it is a wehrmannsgewehr bolt with the unusual extractor. Otherwise some one has opened it up for a belted magnum caliber if it has the standard 98 extractor.

[Harter66]

The 284 Win would be a little short. I'm pretty sure it's a full wildcat the as the build known to be not less than 20yr old. 24'' bbl Varmiter wieght should shoot well. Now to locate dies,and an extractor...........

[Bad Water Bill]

First step is make a chamber cast to see what you really have.

[runfiverun]

that larger bolt face would worry me a little.

the front half sure looks like a 280 Ackley long neck version, but it may be on a belted case [something like a 7x61 Schultz and Larsen or a rimmed case]
it also could have been made by running a 7x57 reamer deeper in the chamber giving you the 40* long neck version.

[WILCO]

First step is make a chamber cast to see what you really have.

That was my first thought. Why waste time?

[Harter66]

The case at the left is the fire form.

The bolt face appears to have been recut . I wondered if maybe it was to accomadate 7x57R . It is definately not 1of the smaller cartridges. The face and extractor are too small for belted mags and the shoulder of a 300WM won't enter the chamber. ( It was at hand) .

98,
There doesn't appear to be any marks or numbers on the bolt . I believe it was polished at some point and not protected the lugs were clean but it had considerable rust and was separated from the rifle for some time. Compaired to a BRNO bolt they're barely cousins.
I would be aimeable to an exchange if you happened to know of one. PM me?

[runfiverun]

so the case length is either 61 or 63 mm ,but the bolt face has been opened.
possibly for a metric cartridge.
maybe a 9.3 x 74R [or 64R] type parent case??

[MtGun44]

Rimmed version of .280 Ackley? Perhaps the owner had that in a drilling and
needed a matching bolt rifle. Same bore diam. . . . . easy conversion.

Seems like most cartridges wound up with a "R" version for drillings at one time
or another.

Bill

[376Steyr]

Wildcat based on the 9.3 x 64 Brenneke case? That has a 0.496" rim. But then the diameter at the base of the fired case should be be around 0.50"

[Harter66]

With the gears grinding slowly this morning , it looks like a 30-40 Krag could be necked and blown out and a little turn down about .04 for a semi-rimmed case. It'll all shake out. I'm still digging.

[Harter66]

As requested a chamber cast that confirms the fire form diminsions including a base of dia .473 .
I recently learned that the previous owner was a caster,so a long necked 280 AI is most likely.

The Brehnke rim would fit the bolt better but those cases will be a little big at the base, new brass might be small enough run through 280 dies for the first shot.

85576

[Harter66]

Gew98,
a couple of bolt pictures the straight bolt is from a BRNO 8mm while the bent bolt is from the 1916.It looks like the same parts to me beyond the ovals in the BRNO and the larger face.

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