You probably already know this, but if you strike out, you can always neck 6mm Remington brass up to 25-caliber as that brass is formed by necking .257 Roberts brass down to 24-caliber.

MidwayUSA might have .257 Roberts brass.

Ed

 

Ive bought it at Midway.

 

I have several boxes of WW +P, but am not really interested in letting them go. If you can't find .257, you could always try either 7x57 or 6mm Rem - they're the same case except for the neck size, and a trip through the full length sizer should fix that. You might need to trim the 7x57 after.

 

As mentioned above, Midway has all you could want.

May not be the price you want, but ...

 

7MM Mauser will neck down to 257 Bob. It was one of the original wildcats.

HM

 

Ditto on the 7mm Mauser brass. Some for sale on GB.com right now.

Jeff