read this stuff
http://en.wikipedia.org/wiki/.357_SIG
lots of good info
i am not a big fan of the round for 2 reasons
and it is my personal reasons
1 its a small bullet 9mm and its moving FAST
great danger of over penetration (IMHO) say you live in a normal house you shoot a guy coing in your bedroom the bullet goes thru him or misses (can happen) its going to keep going thru to other rooms like 1450 fps
2 its a bottle neck cartridge and many are not allowed for hunting applications
also not a lot of good bullet choices for loads
Because the .357 SIG fires at relatively high pressures, muzzle flash and noise are significant with standard loads
The recoil of the .357 SIG cartridge is strong, often noticeably more so than the .40 S&W
it is not an easy gun to shoot for a beginner (not saying you are a beginner) just point facts out
i personally like .45
i am forced to carry a .40 dept issue and i hate the round
for a good SD and hunting gun look at a .357 mag revolver and you can down load it with .38 for lots of cheap target practice