he Sig P250 & P320 world is a little confusing what with the modularity and all - however, you can purchase them configured as such:
The P250 comes in
a Full-size
a Compact
a Subcompact
(all can be had in 357Sig)
The P320 comes in
a Full-size
a Carry
a Compact
a Subcompact
They make all but the Subcompact in 357Sig. The difference between the Carry and the Compact is length of grip only.... the Carry holds 14 rounds while the Compact holds one less at 13...
I believe all the stock pistols come with the medium circumference grip and then you can buy the small or large frame/grip module aftermarket ($46)