What makes rimfire cartridges unreliable compared to centerfire cartridges?

What makes rimfire cartridges unreliable compared to centerfire cartridges?

  1. 3 weeks ago
    Anonymous

    Due to the way they're made the primer isn't uniform and may not ignite on the first strike or at all at certain points in the rim

    • 3 weeks ago
      Anonymous

      Yeah

    • 3 weeks ago
      Anonymous

      The priming. A center fire cartridge has a primer that's a small cup filled with shock sensitive stuff that is sure to go off because its all right there. a rimfire needs to have its shit stuffed into the entire rim which is harder than just filling a separate cup. In bulk pack ammo they just shove the shit in and hope for the best and usually these days its good enough but there's still times when you may have to rotate the round so the firing pin hopefully hits another area that has priming compound.

      Would a centerfire cartridge with a nonfunctional brass rim still be as reliable as a regular centerfire cartridge?

      • 3 weeks ago
        Anonymous

        In terms of going boom, yes. In terms of extracting and ejecting, no.

      • 3 weeks ago
        Anonymous

        You mean a rimmed cartridge like the ones commonly found in revolvers?

        • 3 weeks ago
          Anonymous

          In an autoloader tho

          • 3 weeks ago
            Anonymous

            Rimmed cartridges flat. Unergonomic. No like ejector. Unrimmed cartridges have little flippy groove between case and recessed rim. Ejector catch little flippy groove, launch cartridge smooth and ergonomically. Weird territory entered with semi rimmed cartridges. A blasphemy unto God.

            • 3 weeks ago
              Anonymous

              Rimmed cartridges also tendency to rim lock when used by average (retarded) soldier. No good. Stop shooty make dead bad.

          • 3 weeks ago
            Anonymous

            God hate semi-rim cartridge. Nuke twice for affront to humanity.

            • 3 weeks ago
              Anonymous

              Why did they do it bros?
              The death marches, the human experimentation and then this shit too
              Why were they like this?

              • 3 weeks ago
                Anonymous

                You want the long or short version?

          • 3 weeks ago
            Anonymous

            i think the fact that the person who made that sign thought it was necessary to use quotes is more annoying than someone ignoring it

      • 3 weeks ago
        Anonymous

        Yes. The rimfire unreliability is because the ring-primer is unreliable.

    • 3 weeks ago
      Anonymous

      The priming. A center fire cartridge has a primer that's a small cup filled with shock sensitive stuff that is sure to go off because its all right there. a rimfire needs to have its shit stuffed into the entire rim which is harder than just filling a separate cup. In bulk pack ammo they just shove the shit in and hope for the best and usually these days its good enough but there's still times when you may have to rotate the round so the firing pin hopefully hits another area that has priming compound.

      Not OP but that's odd, I always assumed there was like an inherent design flaw rather than just a quirk of how the cartridges are mass manufactured.
      Could you potentially design around this by doing something like making the firing pin larger?

  2. 3 weeks ago
    Anonymous

    The priming. A center fire cartridge has a primer that's a small cup filled with shock sensitive stuff that is sure to go off because its all right there. a rimfire needs to have its shit stuffed into the entire rim which is harder than just filling a separate cup. In bulk pack ammo they just shove the shit in and hope for the best and usually these days its good enough but there's still times when you may have to rotate the round so the firing pin hopefully hits another area that has priming compound.

  3. 3 weeks ago
    Anonymous
    • 3 weeks ago
      Anonymous
      • 3 weeks ago
        Anonymous

        Does nonuniform powder burn make any difference as far as accuracy?

        • 3 weeks ago
          Anonymous

          I dont have any qualifications to speak of in this field but my guess is that its less efficient overall because it doesn't exert uniform force across the base if the bullet during firing

          • 3 weeks ago
            Anonymous

            Nah, that's not true. The primer compound is a literal explosive. When the primer is set off it ignites 360 degrees around the rim far faster than the powder itself burns.

            what is the point of berdan primers? just seems like an extra step

            The primer itself is cheaper because there is no anvil in it.

            [...]
            [...]
            maybe in a smooth bore. rifled barrels fix this.
            maybe this is where the "bounce" meme comes from

            Spinning the bullet has nothing to do with those anon's concerns. Inconsistent ignition affects the powder burn rate and therefore the pressure curve of the cartridge, which in turn affects velocity, which affects accuracy. It's mainly a concern for very large cartridges, not rimfire vs. centerfire, and there are various ways of dealing with it, like using bigger primers (compare .50 BMG primers for example), flash tubes (like most "cannon" shells), designing short-but-fat cartridges for benchrest like the McMillan "Fat Mac", and using small amounts of very fast powder to act as an igntion booster in large safari cartridges. Rimfire doesn't have velocity issues because of inconsistent burn. It has reliability issues because sometimes there's no primer compound in the rim where the firing pin strikes it.

        • 3 weeks ago
          Anonymous

          in theory, yes.

          practically speaking, only if the barrel is ludicrously short, like 1" or less. otherwise there's enough time for pressure to build and stabilize behind the round as it travels down the barrel, even in pistols.

          the unreliability is almost 100% due to the priming compound not always being uniform in the rim. there's also an old trope that continues to this day, because older rimfire rifles had different firing pins/bolt faces. nowadays most have a crescent shaped pin that strikes the rim in multiple places, not just one spot, thereby greatly reducing any misfires.

          i have fired over 1,000 rounds through a cheap Savage 64 and I have had a total of 1 misfire. and i fire shit cheap ammo too.

          • 3 weeks ago
            Anonymous

            >the unreliability is almost 100% due to the priming compound not always being uniform in the rim. there's also an old trope that continues to this day, because older rimfire rifles had different firing pins/bolt faces. nowadays most have a crescent shaped pin that strikes the rim in multiple places, not just one spot, thereby greatly reducing any misfires.
            Ah, that answers my question then:

            [...]
            Not OP but that's odd, I always assumed there was like an inherent design flaw rather than just a quirk of how the cartridges are mass manufactured.
            Could you potentially design around this by doing something like making the firing pin larger?

            So you'd say that the issue of non uniform primer distribution in a rimfire cartridge can be - and has been - designed around with the design of the firearm? It sounds like it given your experience.

            • 3 weeks ago
              Anonymous

              It's not really an issue anymore. Any time I see someone bitching about all the misfires I ask how often they clean their gun and the answer is inevitably "never" or "almost never".

              .22LR is a filthy cartridge, a few dozen rounds and your action will be coated in black. This fouling can result in more friction, weaker striking, and thus no detonation of the primer at all. Clean your .22 after using it and keep it oiled and you shouldn't have any problems. I shoot the cheap milk carton .22 and never have issues.

        • 3 weeks ago
          Anonymous

          I dont have any qualifications to speak of in this field but my guess is that its less efficient overall because it doesn't exert uniform force across the base if the bullet during firing

          https://i.imgur.com/Fq1Fqqx.jpg

          in theory, yes.

          practically speaking, only if the barrel is ludicrously short, like 1" or less. otherwise there's enough time for pressure to build and stabilize behind the round as it travels down the barrel, even in pistols.

          the unreliability is almost 100% due to the priming compound not always being uniform in the rim. there's also an old trope that continues to this day, because older rimfire rifles had different firing pins/bolt faces. nowadays most have a crescent shaped pin that strikes the rim in multiple places, not just one spot, thereby greatly reducing any misfires.

          i have fired over 1,000 rounds through a cheap Savage 64 and I have had a total of 1 misfire. and i fire shit cheap ammo too.

          maybe in a smooth bore. rifled barrels fix this.
          maybe this is where the "bounce" meme comes from

    • 3 weeks ago
      Anonymous

      what is the point of berdan primers? just seems like an extra step

    • 3 weeks ago
      Anonymous

      >centerfire has a leaf in your cartridge

  4. 3 weeks ago
    Anonymous

    Manifacturing.
    >Drop primer compound /paste/ solution. Im not sure

    > spin the primed casing so the primer compound spreads out around the rim like a centrifuge

    Sometimes you get gaps (depending on the quality of manifacture.

    Add the rest of the shit to make a boolet

  5. 3 weeks ago
    Anonymous

    rimming

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