Of course, we're talking about a gas operated weapon here, and we're likely to get a gas spike into your piston while the bullet is laboriously making its way out the barrel. That sort of overpressure usually says shit like 'catastrophic failure', and even the notoriously rugged AKM may have trouble getting the bullet out that's about 20% heavier while cutting down on the propellant charge. And while there's no real danger of the world running out of M1943 ammo in the next gazillion years, it's probably best if we put that big slug in the M-N round where it belongs
