Been searching for components for the sig myself.
It was introduced at .355(9mm)
It is apparently (so I've read) somewhat more accurate with .356 but good luck finding that size.
125(or124)gr is the "standard" weight.
Handloads.com shows a starting load of 5.4gr Red Dot, 6.0max with 124gr FMJ @ 37,200 psi
WARNING!: I HAVE NO EXPERIENCE WITH THIS OR FRANKLY ANY OTHER LOAD! USE AT YOUR OWN RISK!
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Nobody plans to screw up their lives...
...they just don't plan not to.
-Andy Stanley
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