05-31-2011, 01:56 PM
The 7.62x25 is significantly longer overall than the 9x19 (unlike the 6.5x25 CBJ) so wouldn't fit into 9x19 actions anyway. I suspect that is one reason why it hasn't seen any recent development work: you need a long action to use it and a long barrel to exploit the velocity potential.
I think that the plastic-cased telescoped LSAT principle brings fewer advantages to the PDW table than it does to rifles and (especially) MGs. The reason is partly that very little PDW ammo tends to be carried or fired (and it's relatively small and light anyway - .45 excepted!), so weight is less of an issue. The other is that the LSAT rounds are fatter than equivalent conventional ones, which would make stacking lots of them in a pistol-grip magazine rather problematic. And of course, the cylindrical shape doesn't aid feeding in conventional actions.
I think that the plastic-cased telescoped LSAT principle brings fewer advantages to the PDW table than it does to rifles and (especially) MGs. The reason is partly that very little PDW ammo tends to be carried or fired (and it's relatively small and light anyway - .45 excepted!), so weight is less of an issue. The other is that the LSAT rounds are fatter than equivalent conventional ones, which would make stacking lots of them in a pistol-grip magazine rather problematic. And of course, the cylindrical shape doesn't aid feeding in conventional actions.