I generally look for FBI standards, look up all the ballistic gel tests I can find, and pick a list of 3-4 for each caliber that look best to me. Hopefully all 3-4 will be reliable in the guns I buy them for so I can choose based upon availability and sales unless one proves to be a favorite for other reasons (maybe it is noticeably more accurate in my guns than the other options, maybe one is US made and another isn't, maybe I like one over another for reasons I can't articulate).
Edit: serves me right for reading the 1st page and some of the 2nd page and not all 4 pages before answering. I answered the original question, but by the time I answered, the thread had evolved into something quite different.
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