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Eliminating cookoff is certainly desirable, but this seems like a very heavy and bulky way to do it (they claim to be comparable in weight to conventional cartridges, which even if true is pretty unfortunate as we are moving to lightweight polymer or alloy cases). Polymer case telescoped ammunition (CTA) seems to be similarly cookoff-proof, based on experimental results from LSAT, and is a good deal lighter. Keeping the chamber from heating up in the first place seems like a better bet than throwing away a lot of heated mass every few shots.
Very high ROF is not necessarily desirable, since it means recoil will be quite stout (5 x .243 all at once!), especially without any mechanical action to soak it up. I suppose you could float the whole action and get some really fast burst action as in the G11 but suddenly complexity is creeping back in. I've seen the claim that rapid shots would crack ceramic plates in heavy body armor, but that's asking for an awful lot of repeatability in a rifle where all five barrels are by design not zeroed on the same point. It also means single-shot accuracy at range is anyone's guess, since you may not even know which barrel you're firing, much less where that barrel is zeroed.
Very high ROF is not necessarily desirable, since it means recoil will be quite stout (5 x .243 all at once!), especially without any mechanical action to soak it up. I suppose you could float the whole action and get some really fast burst action as in the G11 but suddenly complexity is creeping back in. I've seen the claim that rapid shots would crack ceramic plates in heavy body armor, but that's asking for an awful lot of repeatability in a rifle where all five barrels are by design not zeroed on the same point. It also means single-shot accuracy at range is anyone's guess, since you may not even know which barrel you're firing, much less where that barrel is zeroed.