I can see 10mm conversions or Tony's .50AE/.502 to have the carbine make a larger hole in the target. What I cannot fathom is why anyone would want to chamber it in 7.62x25?? Other than cheaper ammo cost than .30 Carbine and a theoretical advantage in feed reliability of the bottleneck case over the straighter cartridge body, there is no advantage in power or performance to be had. The 7.62x25 has less case capacity than the .30 Carbine round, and given equal operating pressures it will deliver less velocity for each bullet weight. Case diameters are similar enough that there is no magazine capacity advantage and the aforementioned feeding advantage is lost upon the typically smooth feeding tapered carbine round.
I suppose one could tout commonality of ammunition with the CZ-52 or Tokarev pistol, but the fact that someone can use the same ammo for in their rifle in their obsolescent, ergonomically challenged pistol doesn't appear to be a big selling point. A .30 BlackHawk or AMT AutoMag will take the same ammo as the M1, if that is the case. I love the 7.62x25 round as much as the next guy, and I would gladly a buy well crafted modern pistol made to chamber the round, but here it just doesn't seem worth it to spend the extra money to get a rifle that fires a weaker, yet marginally less expensive round.
If one wants to rechamber the rifle just for esoteric reasons, why not pick a weirder, more fringe calibers. 9mm Mauser Export anyone? 10mm Mag? .224 Boz? 5.7x28? 9x25Dillon? .357 or .44 Automag?
I'm glad some other than the annoyingly self-hyping Tim LeGendre decided to play with opening up the bore on the carbines. It seems like I've seen the articles about LeGendre developing these rifles appear several times in the gun rags, interspersed just enough to keep our interest alive. Apparently LeGendre spent so much time "being the baddest kid on the block" and "sticking it to" the conventional gun designers, that he failed to consider the many short comings of his design modifications. The concept of sectional density is lost upon him, and he tends to exaggerate the specs of his cartridges to make for better copy. Unfortunately there is never word of when these rifles or modification services are going to be ready, nor any way of contacting him. The weapons the evaluators actually get are plagued with feeding/reliabilty/durability problems and are haphazardly tested at best. From what I've seen of Tromix guns, they work as advertised and are actually available to the shooting public.
