You got plenty of replies, mostly agreeing that the empty chamber is a bad idea. I agree as well.
I pocket carry daily, either a J frame .38 Special (M649) or a Walther CCP 9mm (basically my only polymer handgun and definitely my only striker fired handgun). In pocket holsters, of course.
Drawing a handgun from your pocket is a more complicated process physically than drawing a handgun from a belt holster, either IWB or OWB. It doesn't "seem" to be more complex but if you break the "motions" down you can see that it really is. That's why you practice!
Therefore, adding another step, to wit, racking the slide to get a round in play, is simply a very bad idea. Too much time wasted with adrenaline pouring into you and danger about to strike - or you wouldn't be pulling the gun out, right?
Personally, I think you should only pocket carry a TDA handgun or a striker fired handgun because you certainly don't want to carry a cocked and locked single action pistol in your pocket and, while cocking the hammer from Condition 2 isn't as slow a step as racking the slide it is still a step you don't need.
I suspect your post will get a lot of replies. Personally, at this time (more on that in a bit) I would not pocket carry a striker fired gun, round in the chamber, without a thumb safety.
There's a lot to be said for that remark and since the thumb safety on my CCP swipes off super easily I have learned to carry that gun that way. Still, a world of difference between that and a single action pistol which should never be carried in a pocket. IMHO. YMMV.
The SIG under discussion, however, as far as I can tell, is striker fired and doesn't have a thumb safety. I wouldn't let that discourage me from carrying that gun in a pocket if it fits there, with a round in the chamber.
FYI - side note:
Military doctrine often calls for condition 3 carry as the rear area troops who are more likely to rely on a pistol usually have some warning. Alternatively, in the case of the early decades of the Israeli army they used a condition 3 carry doctrine as they had a mishmash of various semi-auto pistols and that doctrine could be consistently applied to all of them, which was important for standardized training.
Last time I watched IDF members train they still used condition 3. But they were so fast their hands were a blur!
