starline makes x25 brass and sellar & bellot sell boxer primed x25 finding brass is not a issue. I just figured that since i was going to have to reload any way I might as well take advantage of the 2mm extra mag capacity. as far as cutting down 45mm case to 25 who cares its cheap and heavy duty. guys have been making 9x23mm out of it for a long time even before winchester released the 9x23. If 23 mm win brass was easy to get then I would just use it. the whole point of my project is to get as much out a a converted tokerov pistol as possable. as far as opening up surplus brass its not going to be much work at all it takes me about 2 seconds to pull a bullet. If it can be expanded then its just a matter of dumping the powder and saving for future use adding new powder and seating the bullet. It really wont take much more time than if were seating a primer and loading a normal round. Ill have to see if I can expand it or not. If I can were talkin near or at 357 performance for around 15-20 cents a round VS about a $1.00 for reall 23x9mm stuff. I really cant afford to shoot a pistol for fun unless its cheap and reloadable. ill be able to buy and convert a Tokarev for around $230 and it will give 357 like performance thats hard to beat even with a revolver. not to mention I think I can still shoot 9x19,largo, 9x23 and others.
I guess I don't understand where you were going with your idea of opening up 7.62x25 to 9x25. It seems like a lot of work unless you can locate some Boxer primed brass x25.
You could do the same thing by cutting off a .223 to 25mm and stuffing a 9mm bullet into it, and you'd have something reloadable.