I planned on responding in more detail to help you adjust some views, but I went back and re-read that old thread you referenced regarding your Canik, and I can't take it all over again. 
That said, I can't let this go:
My CZ Poly guns simply run better with full powered ammo.... And I have mentioned before, the Canik will choke on low powered crap. They are just not sprung for it!
Did you really just explain that your poly pistols need "full" powered ammo because "They are just not sprung for it!" and in doing so reference that old thread that you got locked because you were fighting people advising you to respring your pistols? That's comic gold, brother.
****
On a serious note, your idea that your progression looks good and 1200 feet/sec is not out of the question -- you're not looking at that process correctly. A 3-rung ladder has just TWO changes in velocity. That's not much of a trend. And when you're operating with .2gr increments, you have no idea what your final tenth of a grain was worth. That final tenth of a grain that you can't see may very well have shown the diminishing returns that tell you that your useful load range is rapidly coming to an end. And even if it doesn't, you can never use that process to predict out .3gr - .4gr for another 85 feet/sec from the top end of a load window because you never know when that first big velocity drop is going to come. At the top of the useful load range, that can happen at any point. You are already well above any published data for 231 and a 124/125gr JHP that I have, and I have a bunch. You are in a space where caution is important. If you want a 124gr bullet doing 1200 feet/sec, pick an appropriate powder.
Why is it that I am always the bad guy for asking questions?
Ok, ID, let me see if I can clarify a couple of things. I now have three military grade poly pistols that were built around the Nato ammo. They are all heavily sprung from the factory.
Two of these guns are CZ. A P-09 and a P-07, they are rated at 20lbs factory. Same spring in both, with the shorter gun preloaded even more than the other.
Proper spring options are few, with CGW offering a 18 lb and a 15 lb. I run one of each, and although the guns will function with low powered ammo, say 115 at 1050fps or about 120PF, function is marginal and they will dump brass on your feet. 125PF seems to work well enough for ringing steel, although ejection pattern is about two feet.
The Canik is also heavy, but I have no measure. It is a Walther knockoff. I have found no(zero) spring options here. It will choke on 120PF, with 125PF working, but ? and 130PF rocking it pretty well.
So when I started this thread, I was a bit surprised that this powder seemed to easily meet the 125PF mark, which others have confirmed, and although I had no intension of pushing it, I simply asked if anyone had done it.
Yes, ID, you are correct, as my test window was small, and I have no real reason to expand it myself, yet that question was never answered.
Add yet the question still remains when you asked what is soo special about 1200fps, what indeed are you going to use to simulate the recoil moment of full powered or plus P defensive ammo? Although this is another topic we might expound upon.
My two typing fingers hurt now. Good night!
