I went to the range today and took the Rastoff Challenge II, no draw (not allowed). I also didn't have a timer, but since the TX CHL rules are generous, I'm sure I got off all shots within the time limits. I used three of my semi-autos, my M&P 40c, my Shield 9, and my SIG P320c 9. Here are the results, along with the target photos:
I shot the worst with the 40c, with three shots out of the 5-point zone, all from 15 yards. Since I practice a lot at 15 yards, I was surprised to see these flyers.

For ammo, I was shooting Win Ranger 180 FMJs for the very first time, so that could be the explanation. Yeah, that's the ticket, it's the ammo...
Nevertheless, under the generous scoring system, I got 246 out of a maximum of 250.
In second place was my SIG P320c, using American Eagle 147 FMJ. The SIG is very accurate, and here I only had one shot out of the 5-point zone, for a total of 249.
And now to the winner. As good as the SIG and 40c are, they couldn't beat out the humble little Shield, which scored a perfect 250 using ordinary Win 115. I've also shot the Shield a lot at 15 yards, and I've never seen it more accurate. It's amazing for such a short barrel. It must have been me, it couldn't have been the ammo...
I still have one gun left, a SIG P250sc .380. I'll put it through the Rastoff Challenge II in the next couple of weeks.
Thanks to Rastoff for thinking this up -- it was fun!