Comments by "" (@neutronalchemist3241) on ".30 Super Carry: My 7.65 French Long is Back! (feat. S&W Shield Plus)" video.

  1. As already said, the .30 Super Carry is more similar to the 8mm Roth-Steyr, both for dimensions and energy.
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  2.  @angry_ike7628  7.65mm Parabellum produces 412 Joule of energy, not ft-lbs. Those are 304 ft-lbs. Not really different than the 8mm Roth-Steyr (that would easily surpass it with a bullet of comparable weight). Overall lenght: .30 Super Carry, 29.7mm, 8mm Roth-Steyr, 29,0mm 7.65X20 Longue, 30.24mm Bullet diameter: .30 Super Carry, 8mm, 8mm Roth-Steyr, 8.16mm 7.65X20 Longue, 7.85mm Base diameter: .30 Super Carry, 8.8mm, 8mm Roth-Steyr, 8.85mm 7.65X20 Longue, 8.53mm Bullet mass: .30 Super Carry, 100gr, 8mm Roth-Steyr, 113-116gr 7.65X20 Longue, 77gr Energy: .30 Super Carry, 470J 8mm Roth-Steyr, 390-410J 7.65X20 Longue, 297J. So I confirm, the .30 Super Carry is more similar to the 8mm Roth-Steyr, both for dimensions and energy than to the 7.65X20 Longue, that shoots a much lighter bullet with much less energy. The 7.65 Parabellum has very similar performances to that of the 8mm Roth-Steyr, especially considered that the 8mm Roth Steyr would develop more energy with a 100gr ball (a la .30 Super Carry) and even more with a 93gr ball (a la 7.65mm Parabellum).
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  3. There had been several 9mm double feed pistols that weren't particularly wide. The Type-92 is probably the most "normal looking" example.
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  4.  @eloiseharbeson2483  More than they taught Physics and basic grammar in your evidently. For the second, I said "MORE similar", and there's no doubt than the 8mm Roth-Steyr is MORE similar to the performances of the .30 super Carry than the 7.65X20 Longe. You can check the meaning of "MORE". For the first, muzzle energy is 1/2massXsquare of the speed. .30 super Carry 100gr, 380m/s, 470Joule of energy. 8mm Roth Steyr, 116gr, 332m/s, 409 Joule of energy. It's not that much of a difference, especially considered that the speed of the bullet, for a given pressure tend to increase linearly with the reduction of the mass, while the energy increases with the square of the speed, so, with a 100gr bullet, the 8mm Steyr Roth would develop more energy. Also 45.000 psi is not "three x" of 21.500. So your elementary school was not that good for math as well it seems.
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  5.  @eloiseharbeson2483  Because you should be someone "who knows more"? Without understanding basic math, physics or even having really learnt to read? You are a blatant example of the Dunning-Kruger effect, aren't you? I already told you what the performances of the two cartridges are. It's not my fault if common pistol cartridges' performances in general have not increased much in the last century. It has to do with human anatomy. 8mm Roth Steyr was nothing exceptional in 1908, like .30 Super Carry is nothing exceptional now. As for "knowing so much about the performance of .30 SC", I don't know much. I only know a little more than the "nothing" you do. I just cared to know enough about ballistic to understand what I read and, knowing enough about ballistic to understand what I read, I can explain you (or better, I can explain. Unfortunately you can't comprehend) WHY having more than doubled the case pressure in respect to the 8mm RS resulted in a so meagre increase in the performances of the .30 SC, when the external dimensions of the cases are so similar. Do you know what's the difference between a 21500 psi case and a 45000 psi one? Brass thickness. But increasing the brass thickness of a rather small case, you significantly reduce the internal volume, and that hampers the effect of the increased pressure, because the initial spike in pressure decreases more rapidly as son as the bullet starts moving.
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  6.  @eloiseharbeson2483  .30 Super Carry is 45.000 psi and 1250 fps out of a 4" barrel. .30 super Carry 100gr, 380m/s, 470Joule of energy. 8mm Roth Steyr, 116gr, 332m/s, 409 Joule of energy. With a 100gr bullet for both, they would be pretty close.
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  7.  @MEGALODONGERS  It almost seems the designers of the .30 super Carry got carried by the idea of the superpressure. More than doubling the pressure, they obtained a meagre 20% raise in energy when both are fired from a 5″ barrel. A “8mm RS Magnum”, with a 1mm longer case (so 30mm overall lenght, still compatible with 9mm Para pistols) and a shorter 100gr bullet, enhancing the internal volume of the case, and so the load, without increasing much the pressure, would have probably obtained similar results, remaining also compatible with blowback firearms, so being much more versatile.
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