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Personally tested this round from the Glock 42 using 10% ClearBallistic gel following the protocols set forth by Marshall and Sanow in their book, Handgun Stopping Power. Test distance 10 feet temperature 44 F. The bare gel test was a failure. The bullet expanded, but only penetrated a distance of 9.35 inches. Well short of the minimum of 11 required by Marshall and Sanow. 11 inches is the minimum because rounds will penetrate on average 15-20 % further in living tissue than in 10% gel, and comparing with the autopsy reports, Marshall and Sanow figured 11 inches is the minimum required to help assure a hit to the vitals, especially if the bullet must first pass through an arm from an angled shot. Thus, this round was not tested in denim due to bare gel test failure. Not recommended.