I got a 20mm round

It look smaller...
Is it supposed to be small like that?

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  1. 1 month ago
    Anonymous

    It's a pet peeve of mine how small bullets are. here's 308, a real man-stopper of a battle rifle cartridge. and right next to it is a pocket knife that would be too small to be a reliable self defense weapon. and yet its blade is bigger than the whole cartridge, let alone the bullet. I get why the bullet is so much deadlier, but it just feels wrong

    • 1 month ago
      Anonymous

      it just goes to show how efficient firearms are at killing stuff, even after we get lasers and railguns they will never really go away

      • 1 month ago
        Anonymous

        They're so efficient that we'd need to invent actual magic for lasers and railguns to replace them.

        • 1 month ago
          Anonymous

          smartphones are actual magic to someone living 50 years ago

          • 1 month ago
            Anonymous

            50 years ago was 1970, they could absolutely comprehend a multi-purpose portable computer and communication device. People from 100 years ago, at least the ones that were tech-savvy for their time, could get to grips with it too.
            But I think that's besides the point you were making.

            • 1 month ago
              Anonymous

              1974 to be precise.

            • 1 month ago
              Anonymous

              we're talking about the physical hardware, not the concept. we're currently conceptualizing way more high tech than just lasers and railguns, but like you said, they require "literal magic" to run. A modern day flagship smartphone is a more powerful computer than your run of the mill desktop PC from 2010, now imagine it compared to a computer from 1974. Plus the screen, camera, gyro sensors, all in a device that weighs oz and fits in your pocket, oh and it also runs for several days off of a recharge that takes only 2 hours.
              And that's not even considering the internet, which is an integral part of the smartphone.

              • 1 month ago
                Anonymous

                You do realize your phone is dumping a lot of potentially dangerous radio energy into your sensitive flesh, right? Anumber of you and your loved ones WILL die from this.

              • 1 month ago
                Anonymous

                Not really dangerous,some radowave are dangerous (ex:microwaves) but not on the phone,unless you have your head sticked in the phone

            • 1 month ago
              Anonymous

              Xerox Park was a thing then. My dad used a "portable" computer that weighed thirty pounds, sported a 4-inch monocolor screen and ran SAMNA for its word processor via ZDS floppies. It was connectable via ATT modem to corporate and BBS. I hold PhD's in CS and EE/hardware design. While I couldn't avail myself of massive parallels, I still built awesome "computers" for USA that can still resolve these issues quickly.

    • 1 month ago
      Anonymous

      You tried to shove it up your gaping ass, but felt nothing, didn't you

    • 1 month ago
      Anonymous

      Leatherman Wingman?

      • 1 month ago
        Anonymous

        leatherman sidekick but I don't think you'd be able to tell the difference from that picture. pretty sure the main knife and the handle are identical

    • 1 month ago
      Anonymous

      black powder firearms had massive bores on the other hand
      anything smaller than 50 caliber was hardly enough for taling down men if it was a rifle, and 44 cal was standard for pistols
      in smoothbore days people were using 75 caliber guns which is how big a 20mm is

  2. 1 month ago
    Anonymous

    Were you expecting 20cm?

  3. 1 month ago
    Anonymous

    It's a training round - notice the blue color and "T" markings.
    They come in smaller doses so you can train for an immunity to full-size 20mm rounds

  4. 1 month ago
    Anonymous

    Thank for the help.and no,i know 20mm is 2cm
    it's about the size of my hand (average hand size)

  5. 1 month ago
    Anonymous

    20mm is barely an autocannon. The shells are pitiful.

    • 1 month ago
      Anonymous

      why is 40x364 so looong

      • 1 month ago
        Anonymous

        To penetrate and shred better

      • 1 month ago
        Anonymous

        It's an old cartridge, it needed a lot of case capacity for primitive smokeless propellant and the designers of the time hadn't figured out yet that short and fat means a more efficient burn.

  6. 1 month ago
    Anonymous

    If i remember correctly,like OP said it's a training round for the M61 vulcain. It's also inert

  7. 1 month ago
    Anonymous

    Yes

  8. 1 month ago
    Anonymous

    its only slightly larger than the diameter of a 12 gauge, far from being an artillery round
    75mm/3 inch is where artillery starts, you should collect those instead

  9. 1 month ago
    Anonymous

    As a /k/ tourist, how do you convert between caliber and mm size? Are they two different systems or what?

    • 1 month ago
      Anonymous

      .50 BMG is 1/2" or 12.7mm.

      • 1 month ago
        Anonymous

        caliber is percentage of an inch. one inch is 25.4mm so 20mm means the projectile has a diameter of about 4/5 of an inch.
        .50 caliber is 12.7mm
        .30 caliber is 7.62mm
        .223 caliber is 5.56mm
        outside of rounds that have existed on the american market and then got nato designations you'll generally use one or the other and not convert.

        just know the common sizes and what they are in inches, and you'll notice a pattern
        5.56mm >.219 inches (roughly .22)
        7.62mm > .30 inches
        20mm > .76 inches
        40mm > 1.57 inches
        50mm > 2 inches~
        76.2mm > 3 inches
        105mm >4.1 inches~
        155mm > 6.1 inches~

        Ah! that makes sense to me now! thank you!

    • 1 month ago
      Anonymous

      caliber is percentage of an inch. one inch is 25.4mm so 20mm means the projectile has a diameter of about 4/5 of an inch.
      .50 caliber is 12.7mm
      .30 caliber is 7.62mm
      .223 caliber is 5.56mm
      outside of rounds that have existed on the american market and then got nato designations you'll generally use one or the other and not convert.

    • 1 month ago
      Anonymous

      just know the common sizes and what they are in inches, and you'll notice a pattern
      5.56mm >.219 inches (roughly .22)
      7.62mm > .30 inches
      20mm > .76 inches
      40mm > 1.57 inches
      50mm > 2 inches~
      76.2mm > 3 inches
      105mm >4.1 inches~
      155mm > 6.1 inches~

      • 1 month ago
        Anonymous

        0.315 In => 8.001mm

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