Some IPSC competitors shoot 9x23 for "major" power class without the need for a hot load.
The 38 Super and 9mm can both be loaded for "major" power class as well, but they need to be on the "hot" side.
I shoot an STI Trubor in 9mm with hot hand-loads to make major in IPSC competition. Contrary to popular belief, standard 9x19 parabellums cases can take the higher load without any problems.
http://www.stiguns.com/guns/TruBor/TruBor.php
The 38 Super and 9mm can both be loaded for "major" power class as well, but they need to be on the "hot" side.
I shoot an STI Trubor in 9mm with hot hand-loads to make major in IPSC competition. Contrary to popular belief, standard 9x19 parabellums cases can take the higher load without any problems.
http://www.stiguns.com/guns/TruBor/TruBor.php