Paveway,
The .30 Luger is on the same casehead as 9mm, the .357 SIG is almost a .40 S&W necked to 9mm. It drives a 125 grain bullet at about the same velocity as a high end handload for a 93 grain .30 Luger, and faster than factory. I don't call a 34% increase in both energy and momentum "almost
identical."
A heavy .38 Super load (like Corbon) will do anything the SIG will; but it takes a 1911 length action to do it. The .357 SIG fits shorter actions, some of which are just beefed up 9mm P.
I tend to agree with your picture of the marketing programs of the industry, but I don't think there is zero improvement along with the changes.
The .30 Luger is on the same casehead as 9mm, the .357 SIG is almost a .40 S&W necked to 9mm. It drives a 125 grain bullet at about the same velocity as a high end handload for a 93 grain .30 Luger, and faster than factory. I don't call a 34% increase in both energy and momentum "almost
identical."
A heavy .38 Super load (like Corbon) will do anything the SIG will; but it takes a 1911 length action to do it. The .357 SIG fits shorter actions, some of which are just beefed up 9mm P.
I tend to agree with your picture of the marketing programs of the industry, but I don't think there is zero improvement along with the changes.
