The 38 Special +P always has "surplus" case volume with smokeless powders and a max pressure of 20K. 357 mag was developed the "extra" case capacity of the smokeless powder 38 Special cartridge became a benefit. 357 mag cannot be fired in 38 Special chambers. That is why the 38 Special can be fired in the. 357 mag was developed from the 38 Special, it used the same dimensions except the casing was lengthened by 0.135" to prevent the mag cartridges from being chambered in 38 Specials. When the 38 Special transitioned to smokeless powder it retained that relatively large case. The large case capacity was needed for the original black powder charge. The 38 Special is the oldest of the bunch and started life as a black powder cartridge. A lot of the differences come down to the development history of those cartridges. The case capacities are very different and I hear what you are saying. A 125 grain bullet could be made to work reasonably well in the 9mm, 38 Special and. So while those 4 share a nearly common bullet diameter, they don't really share a common bullet weight. 357 is probably the most versatile of the bunch in terms of bullet weight and the 380 is the least flexible. The 38 Special really performs its best right around the 150-160 grain bullet weight range and the 9mm shines with 115-125 grain bullets. I've reloaded all of those cartridges and have a tremendous amount of trigger time with the 9mm and 38 Special. (The 380 Auto max's out at around 105 grains and is much happier around 90 - 100 grs) A 125 grain bullet could probably work in 3 out of those 4 but it wouldn't be a viable choice for the 380 Auto. 357 mag do come pretty close to sharing a common bullet diameter (.355" for the 9mm/380 &. OK, I think I'm catching on to what you are saying. I could use them in 9mm but then their weight would cause high pressures and low velocity (isnt physics grand). Now i could use my 100g bullet in all of them. 380 ACP (low velocity, high pressures), would be perfect in 9mm, but would have to be a light plinker in the 357 mag. But it would be anemic and cautious loading for my. My experince 38 SPC is shooting them out of my. I forgot that operating pressures of 38 spc are 20k operating pressures. Or did I miss your point ?You just know more than me. 357 magnum - both cartridges that top out at 35K psi -then we can start talking about case capacity as an important factor. When we level the playing filed a little bit and compare the 9mm Luger to the. While the 38 Special casing does have a lot of capacity (it started off as a black powder cartridge) and the 9mm Luger has a smaller case capacity, the big issue isn't the difference in capacity but rather the pressures they are allowed to operate at.
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