Back in the dark ages,
just after dinosaurs walked the earth, some of us shot P9's (not super but 9x21) to 175 + PF, As memory serves even TGO shot them (Springfield Armory of course), ( he caused me to spend my $$$ on one no three).
Perfectly fine, it can be in 9x19, 9x21 ( my favorite) or 38 super.
Frame sizes are different.
the 9x19 mags are available in hicap (think CZ, minor mods maybe needed) see:
http://ghostholster.com/catalog/index.php?cPath=28_29
or: for 38 super
http://henningshootsguns.com/shop/eaa.elite.magazines.html