I am using a rifle in the caliber I put togeather on a Springfield rifle and a barrel I bought. Do anyone have any data on this cartridge or a spare set of dies. I am using 7x64 RWS and Norma brass and neck sizing with a 6.5-284 die. Been using 6.5-06 data but am sure that it will do better.

Thanks
257AI

I have had a barreled Mauser action sitting around in I think this caliber for almost 20 years.
If you find any information, please PM me about it.
I know it is a .264 caliber and has the name Sabre in it.
I thought I was the only one in the world.

-Spencer