Comments by "" (@neutronalchemist3241) on "Forgotten Weapons"
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@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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@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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There had been two separate issues.
A pair of cases on the SEALs 92SB, and yes, that was due to very high round count and firing an unprecised mix of ammos.
Then on some Army M9, tested for endurance in 1988. 12 had been tested. Generally they reached a very high round count, but a pair of them had the slide cracked at low round count.
Initially the Army determined it was due to the steel alloy of the slide, requested it to be changed, and Beretta modified the slides so that even a cracked one could't be projected out of the gun. However Beretta technicians were not persuaded. They were selling 92 series guns to military and police forces all over the world, and only the M9 of the US Army seemed to have problems. They analysed the results of the test, and noticed all the low counts slide cracks happened only when a single batch of Federal Cartridge ammo was used. Once tested by independent labs, it was determined those rounds developed pressure in excess of proofloads (Beretta sued the US government at that point, and the lawsuit was settled with them receiving further $ 10m). Ironically, the 92 remained known for the "slide cracking" problem, while, at that time, its slides were arguably more robust than those of any Browning design competitor.
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