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"Burst fire is not a good idea unless controllable enough to limit dispersion and that is hard to achieve in a pistol."
What the heck, Youtube? How is there not one video of a full auto five-seven (legal or otherwise) uploaded anywhere? I won't claim such an animal would be controllable, but I am very interested in how it stacks against select fire Glocks and Berettas (and what its rate of fire might be, as well). Someone with an SOT get on this, already! :banghead:
I've stood next to a Beretta rep demonstrating a 93R and was not impressed with the accuracy. These things are really only good as elevator guns for use by assassins.
"The 5.7mm bore size is going in the right direction ballistically but needs some improvement."
Agreed. The 5.7 was designed, first and foremost, for a short carbine with a barrel of some 10 inches. That a pistol was possible in the same chambering doesn't mean it is similarly optimal. Apart from capacity and the fact the round is still serviceable as a duty round, I agree improvement could be made (though at a significant design cost, since a true locked breech would then be needed, with attendant complexity, size, weight, and cost)
"A cartridge that is shorter but larger in than the 5.7 mm FN along with a reduction in magazine capacity to permit narrower stacking in a double column magazine or 10 round single column magazine is needed to limit grip size."
I asked in the reloading forum a while back if there was ever an attempt to 'beef up' the wimpy case head of the 30 Carbine for a high pressure chambering. I think Johnson was really on to something with his PDW cartridge, but the case head simply can't do very high pressures without the primer pocket letting go (same as the 5.7 if you run it even hotter). A 30 Carbine case sharply necked down to ~22/25, with the overall length of 7.62x25 or 5.7x28, then cranked up to 60ksi like 5.56, would be one heck of a bad day for anything. At those pressures, such a little bullet would be accelerated so fast a pistol would get them well above the velocity beyond which Kevlar no longer matters. The slightly larger case diameter would ensure brass strength. As quality as the 5.7x28 is, it's a 25acp diameter head drilled for a small rifle primer, and holding back 50,000psi --there's simply no way to reinforce it further.
Yeah the .22 Spitfire was way ahead of its time but still not going to work well in a pistol.
Functionally, I think the round would be like the Boz or 4.6, though; obnoxiously loud and flashy, hard to control with gas (or recoil!) systems, hard to contain in a small package due to enormous focused bolt thrust, and having painfully short brass and firearm life. Maybe a recoil operation with gas-damping/delay could make things more viable, but H&K's MP7 experience (and lack of pistol offering) indicates a very difficult hurdle when it comes to developing platforms for these 'super' rounds. I think that's why FNH backed off on the pressure like they did, and stuck with more easily tuned blowback actions as best they could.
Nobody said it would be easy! If it was easy, it would already exist.
I think it'd be tragic to force everyone into using the same platforms, if the diversity of something closer to true freedom of choice was in fact not such a terrible burden in the first place. It'd actually be quite interesting to see what kinds of true optimization would take place in such an environment (like we see with our Special guys, who actually get something akin to choice, then "somehow" manage to ferret out the best tools and equipment for their job). Personally, I think you'd see a lot of guys away from the front not waste their allotment on side arms.
Get ready for tragedy because whatever the next pistol is it probably will for the vast majority of pistol using soldiers have at best different grip sizes. You are correct that many soldiers would not choose to carry a pistol in addition to their rifle.