Are these magazines a good idea?

Not the gun or the 5.7 round
What if you scaled one up to 308 length for a rifle
Used those Ackley improved rounds with all the case taper taken out (like the 5.7) and a sharp neck angle
They're supposed to get bubba's pissin hot 30-06 ballistics, 168gr @ 3000fps
How much would the rifle weigh loaded?

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  1. 3 weeks ago
    Anonymous

    Figure 8 lbs for the rifle plus whatever 50 rounds of 308 weighs, I'm too lazy to google that for you.

    • 3 weeks ago
      Anonymous

      not OP but standard 308 fmj is maybe 13 grams in brass, so 50 rounds would be ~1.4 lbs, plus whatever the magazine weighed. Balance would be different then a big drum mag I guess, but still completely putting aside the mechanical issues that's not nothing per mag.

  2. 3 weeks ago
    Anonymous

    if they were, they would be used everywhere
    they are unreliable

    • 3 weeks ago
      Anonymous

      It's not so much the magazines themselves, but the ammunition they require to work. 5.7 has absolutely no wall taper and is rimless, which is what keeps it from binding up in a long straight magazine. No taper means your extraction is a lot harder, which is why 5.7 uses the polymer coating on the cases.
      Basically they work fine for 5.7 but what other round both would work and would you want for it?
      It's a shame LSAT went nowhere, I'd have absolutely cooked up a CT-P90 if the rounds became available

      • 3 weeks ago
        Anonymous

        what's so hard about no taper, rimless and polymer coated?

        If they took the entire p90 concept and just made it work with 5.56, it would be a lot cooler and make more sense.

        that's what I'm saying
        but they want bigger rounds for punching armor and recoil mitigation is becoming a thing anyway

        • 3 weeks ago
          Anonymous

          >what's so hard about no taper, rimless and polymer coated?
          it's not about "hard", it's about "it costs more than just not doing that". The straight-wall and the polymer-coating aren't mutually exclusive.

          • 3 weeks ago
            Anonymous

            so use steel case, it's cheaper and usually coated anyway. and it can be loaded to higher pressures.

        • 3 weeks ago
          Anonymous

          Nothing that isn't already hard about introducing any new cartridge.

          >what's so hard about no taper, rimless and polymer coated?
          it's not about "hard", it's about "it costs more than just not doing that". The straight-wall and the polymer-coating aren't mutually exclusive.

          isn't wrong that it's slightly more expensive and whatnot but the honestly that challenge is negligible in comparison to the challenge of getting any new cartridge adopted, and there's not much else already in existence that fits the bill.

    • 3 weeks ago
      Anonymous

      They work fine in practice but they require you have a totally straight cartridge that also needs each one to be lubricated to extract them so the benefit of a straight 50 round mag versus a slightly curved 30 round mag isn't worth the extra cost and effort of prepping the cases

      what a way to prove you dont own a single gun

  3. 3 weeks ago
    Anonymous

    I will say that I shot my PS90 sbr suppressed recently with a 5.7 specific suppressor and the backpressure literally destroyed the feed lips on two of my mags

    • 3 weeks ago
      Anonymous

      >direct blowback is terrible
      We know.

  4. 3 weeks ago
    Anonymous
    • 3 weeks ago
      Anonymous

      Lemme guess, this is just as much vaporware as the Six12?

      • 3 weeks ago
        Anonymous

        Well, you can see the advertised release year in the picture, and it hasn't showed up yet. Maybe 2007 hijri instead of AD...

      • 3 weeks ago
        Anonymous

        https://i.imgur.com/M4aXEfO.jpeg

        https://i.imgur.com/HD8Hb6q.jpeg

        >Lemme guess, this is just as much vaporware as the Six12?
        Worse. At least we saw the Six12 work. They never even had a magazine that fed, even outside of the gun.

      • 3 weeks ago
        Anonymous

        [...]
        [...]
        >Lemme guess, this is just as much vaporware as the Six12?
        Worse. At least we saw the Six12 work. They never even had a magazine that fed, even outside of the gun.

        It fed and worked.
        Bought by Magpul and shelved.

        • 3 weeks ago
          Anonymous

          >It fed and worked
          No it didn't. I was here for those threads. Go watch the trailer again, if it's even still available anywhere. They work the action and the shells in the mag don't budge. He never showed the mag working. Not even sure we ever even got a picture with a functional follower and spring, most of them didn't even have that.

    • 3 weeks ago
      Anonymous

      https://i.imgur.com/M4aXEfO.jpeg

      sweet, selling my keltec ksg-25

  5. 3 weeks ago
    Anonymous
  6. 3 weeks ago
    Anonymous

    If they took the entire p90 concept and just made it work with 5.56, it would be a lot cooler and make more sense.

    • 3 weeks ago
      Anonymous

      the magazine could not work with 5.56.. like

      It's not so much the magazines themselves, but the ammunition they require to work. 5.7 has absolutely no wall taper and is rimless, which is what keeps it from binding up in a long straight magazine. No taper means your extraction is a lot harder, which is why 5.7 uses the polymer coating on the cases.
      Basically they work fine for 5.7 but what other round both would work and would you want for it?
      It's a shame LSAT went nowhere, I'd have absolutely cooked up a CT-P90 if the rounds became available

      said, 5.7 has no taper, which is why the p90 magazine is able be straight. 5.7 was designed specifically for the p90.

  7. 3 weeks ago
    Anonymous

    >Are these magazines a good idea?
    Yes and no. They limit the length of the cartridge and going with a fatter ammo severely reduces the capacity. I would say for something like the P90 in 5.7x28 or a similar gun chambered in something like 10mm it is worth the complexity of this or a helical. For something like a 5.56 or .308 you would be better off with a coffin magazine or belt feed for that kind of capacity.

    As with everything in engineering it's a tradeoff.

  8. 3 weeks ago
    Anonymous

    The cartridges don't need to be perfectly straight especially if it's a bigger cartridge so you're only trying to fit twenty or thirty in there. They might need to put a track or something for the follower to make sure it doesn't bind up. I assume the reason nobody is doing it is because they think there's no point, not that they think it's impossible.

  9. 3 weeks ago
    Anonymous

    Wide as shit and very heavy. A top loading design would be impractical due to the width, but a side loading one would work pretty well, and I can imagine loading and unloading mags into such a design would be fairly ergonomic and comfortable.
    Wouldn't work for wrong-handed people though.

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