Even still XDs screws me up with thinking plural. Ya, a 10mm XDs doesnt exist because there is no point. Why stuff a hot round in a nuetered gun? An XDs 40 would be the end of reason. With such limited capacity... You would be better off running a snub nose 357. At least there is plenty of those and same capacity.
Mr. Powerman your going to have to help me out here, I do not understand the point you are trying to make.
First, what is the correlation between the power of the cartridge and the magazine capacity? What i get from your post is that since the mag capacity is 6 rounds to stay with a 40 instead of a more powerful cartridge, 6 rounds of 10mm wouldn't be any better.
Secondly, your math does not add up. A 6 round mag + 1 in the chamber is more than your standard 6 shot snub nose 357, then comes the available 7 round magazine with 1 in the chamber.
I'm not trying to be a smart-aleck I just don't understand your logic, Thanks and Have a nice day.