mr.frosty-I doubt they will.They were coming out with the .480 Ruger and .475 Linebaugh but they have to proof them and the .475 Linebaugh is at 55,000 PSI in Hodgdons manuals.That means to proof it the 1895 action has to take some big time abuse and work way up past the 55,000 PSI to be a SAAMI cartridge.The New .454 Ruger was proofed at 93,000 PSI for a 65,000 PSI SAAMI...
Plus those pistol cartridges use hot powder like H-110....I doubt it will happen with SAAMI blessings..Last I herd the two pistol calibers are are on hold........
My opinion........Jayco