Would necking 5.7 up to 7.3 make sense?

Would necking 5.7 up to 7.3 make sense?

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  1. 1 month ago
    Anonymous

    Why? For what purpose? And why not just adopt Tokarev in that case?

  2. 1 month ago
    Anonymous

    Makes sense for handguns, tbh. Get a little more mass at minimal loss of velocity. You'd probably see a general increase in energy in the super short barrels, which is all super useful with how poorly the 5.7x28 performs.

  3. 1 month ago
    Anonymous

    >Would necking 5.7 up to 7.3 make sense?
    No, because 7.3mm does not fit.
    https://en.wikipedia.org/wiki/7mm_Penna

  4. 1 month ago
    Anonymous

    Yeah, you wouldnt need such a long barrel for optimal performance. Also heavier bullets would be possible. Better hollow points etc

  5. 1 month ago
    Anonymous

    What if you did 7mm or 6.5, but with rifle projectiles? That could be fun.

    • 1 month ago
      Anonymous

      >What if you did 7mm or 6.5, but with rifle projectiles?
      Would not be fun, those rifle bullets would not leave any room for powder.

      • 1 month ago
        Anonymous

        Try 3N37

        • 1 month ago
          Anonymous

          Still not a lot of room.

  6. 1 month ago
    Anonymous

    No because then it just becomes a straight wall 7.3mm anemic cartridge.

  7. 1 month ago
    Anonymous

    No, you'd be taking away any ability to fragment in flesh or penetrate armor and "muh wound channels" fans would be out of a job.

  8. 1 month ago
    Anonymous

    its called 7.5 fk

  9. 1 month ago
    Anonymous

    You should be able to fit 7.62 caliber projectiles, maybe. So this would be like 30 super carry magnum, probably in a more conventional browning locked breech. I don't know if it would work but it's interesting enough to try.

    • 1 month ago
      Anonymous

      >You should be able to fit 7.62 caliber projectiles, maybe.
      Not, not even maybe. 7.62mm projectiles are really 7.82mm (at least anything based on a .308 projectile is), while 5.7x28 has a base diameter of 7.95mm. If you made it a perfectly straight walled case (terrible for extraction), that would leave you 65 microns worth of case mouth thickness, or about 2 thou if you're into imperial. That's roughly the size of a human hair, so not gonna happen. There's a reason 7mm Penna is, well, 7mm.

  10. 1 month ago
    Anonymous

    >Would necking 5.7 up to 7.3 make sense?
    They already did that in the 1900's

  11. 1 month ago
    Anonymous

    What about .38 super with a .32 or .25 bullet?

    • 1 month ago
      Anonymous

      Actually, 9x23, since it's higher pressure.

    • 1 month ago
      Anonymous

      If you ignore the rim, .38 Super is roughly the same size at it's rim as the 9mm Luger family. That means with a .32 bullet, you would end up at (roughly) 7.62 Tokarev. As for the .25, it would be somewhere roughly between .22 TCM and 6.5 CBJ, probably a bit more powerful than either because .38 Super implies a 1911 frame, which allows for increased COAL.

      • 1 month ago
        Anonymous

        I was thinking it'd be neat if there was something like a shrunken 9x25 that would have a fair bit more power than .22 TCM or similar.

  12. 1 month ago
    Anonymous

    No, because 7.5 FK exists. Why the hell would you want to frick up the one good thing about 5.7(velocity) by giving it a heavier projectile? Just make a gun in .22TCM, it’s better in almost every way. Hell, make something modern in x25 Tokarev, you’ll get the same benefits as a 5.7 upsize. The development of that cartridge would be better spent elsewhere.

  13. 1 month ago
    Anonymous

    No because it doesn't fix the deck d biggest problem with 5.7, which is the moronic case geometry.

    • 1 month ago
      Anonymous

      >moronic case geometry
      What do you mean by this?

      • 1 month ago
        Anonymous

        Straightwall case means extremely poor extraction to the point that no gun could ever be made reliable. Instead of adding a slight taper like every other cartridge ever, they lube the cases with powdered plastic.

        • 1 month ago
          Anonymous

          >Straightwall case means extremely poor extraction to the point that no gun could ever be made reliable
          Couldn’t that be fixed with a fluted chamber? I know the older roller delayed blowbacks could basically operate with the extractor removed, but idk if that scales down to handguns very well

  14. 1 month ago
    Anonymous

    Neck it down to 4mm

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