I shoot a 257 WBY, but a good friend of mine had a 25/300wsm made up and it is a ballistic twin to my WBY. In fact, one of the Gun rags had a cover story on that caliber, I believe they called it the 25 Pronghorn. Anyway, it appears to be a good cartridge. Have fun with it.
Im in the process, have dies, brass. Reamer on order from Manson, just got proof sheet today. I actually had them call it a 25 Bobcat. I own a landscaping company called Bobcat landscaping Service. Have hart barrrel on order, bought a rem 700 270 wsm to strip for action. Now its a waiting game.
Mike