0.111 inch. the 9mm chamber is .754 inch deep and the 357sig is .865 inch deep. Check the diagrams I attached. As I said the 9mm & 40 SW barrels match the slide with the exception of the diameter of the chamber. after the 9mm is rechambered to 357sig that will match as well. The entire SW357V was a SW40V with a 9mm barrel chambered for 357sig. SigArms P229 barrels for the 2 calibers differ only in the shape of the chambering guide. As for porting, no plans on porting presently.
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