I noticed in the reloading section a 25-300 win mag.There is no name or identification as to who did this work.I would like to know who chambered the barrel and where the dies were obtained.Thanks for any help here.

Can't help you on your question. However a couple of years ago I necked a 300Wmag case down to .257. My measure water capacity was the same as the listed capacity for the 257 Wby mag.