Well, another 150 rounds down range this morning. Regardless what spring was in the gun, it still has issues. Mostly the issues are ejection related, but there were a couple of fail to fires in there as well.
I'm guessing the SIG factory spring is a 12 pounder, just by the way it and the Wolff 12# spring compare, in looks and function.
When I tried the Wolff 11# spring, I was having a stoppage every 2-3 rounds, so I dont think thats "the one". With the factory and Wolff 12# springs, it was roughly once every mag, with an occasional two mag run without issue. Still not the one, but better.
As far as the failures go, the most common was the empty not clearing the port, but they werent "stovepipes", the brass was stuck in the port, looking as it backed out of the chamber and popped straight up and was caught by the slide and barrel. The case was parallel with the bore, with the case mouth centered on the upper, back face portion of the rear of the barrel/chamber, and the base of the case against the breechface. The cases were not boogered up in the least, just stuck there.
I also had a number of fail to fires, which seem to be the result of the slide not going fully into battery. When it did occur, you really had to look to see it wasnt, they were that close, and a push with the thumb on the rear of the slide usually settled it, and the gun would usually fire when thumb cocked and the trigger pulled again.
Another issue is the brass. Out of 150, I have about 20 pieces that are boogered up, and about 8 of them are beyond being reloaded. The others will probably work out, but there may be a couple more, I'll have to see. The case mouth appears to have come back directly into the to the top rear edge of the port, placing two "v" shaped wedges into the case mouth, some are a lot worse than the others, but they are all similar. At this rate, I'm loosing brass (due to the gun tearing it up) somewhere in the vicinity of 5% or so each outing. Its bad enough the gun chucks them all over the place, making them hard to find, now its routinely destroying them too.
At this point, I'm not even going to bother with ordering SIG springs, as I dont see the point. Even if I did, and SIG even had them, the gun wont be here when they arrive. As soon as I get it cleaned up, its outta here. Chalk this one up to "thats what you get for not taking your own advice".
If you have one that works, I'm happy for you, hope it continues to do so. Other than the on going aggravation for me, they are a cool little gun, and I really would have liked to see it work. At this point, I'm just going to stick to my P230's and be happy. They always work.