I went to the range yesterday and tried out a variety of new loads, among them were a couple start tests using WST. I was shooting 3 guns for comparison A S&W 5906 (4") and Sig P-290 (3") and a Kahr CM9 (3")

I used 2 different Berry's CPL bullets, a 124 Round Nose (actually weighs 122gr) and a 124 Hollow Base Flat Point (HBFP).

Interestingly, I found these same two bullets listed in the 2010 AA load book for AA-5. what was more interesting was the MAX charge was a full .5gr different. (5.8 vs 6.3). I also note that they had a .10" OAL difference and that the shank may be longer on the one, so I took this as an alert to be careful when looking at data as the HBFP may require reduced loading.

I loaded up a few with Win cases and Magtech primers, medium crimp.
Here is a summary of the chrono results (10')

122 Berry's CPL.RN 4.5gr WST @ 1.120"oal

SW-5906 Avg.fps=1057 SD=9.4 ES=22
Kahr CM9 Avg.fps=965 SD=13.3 ES=34
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124 Berry's CPL.HBFP 4.2gr WST @ 1.072"oal

SW-5906 Avg.fps=994 SD=15.8 ES=43
Sig P290 Avg.fps=911 SD=23.1 ES=56

I don't know if it was my imagination but it seemed the lighter HBFP has more snap and muzzle flip even though the cases were only being thrown half the distance of the heavier load.

I will play with this powder some more.