The Military Arms Channel (MAC) performed a bare gel test of Underwood's .32 ACP 50 grain Cavitator +P compared to Hornady XTP and posted it on Youtube today (Oct 10, 2016). He also fired a 230 gr .45 ACP round into the same gel block, which provides an interesting comparison. Be sure to check out his concluding comments beginning at 16:47 in the video. [ame]https://www.youtube.com/watch?v=pMKYal5Tles[/ame] The test also included Underwood's 85 grain Cavitator in .30 Carbine vs Hornady's 110 grain FTX in an M1 Carbine, but that won't be discussed in this post. Test Protocol - Bare 10% Gelatin provided by Doctor Kote - Mauser 1934 with a 3.4" barrel - Velocity was not measured. - Wound channel was measured and shown in good detail. Penetration and Expansion Results ............................................... Penetration Underwood 50 gr +P ............. 18.5" Hornady 60 gr XTP ................ 15" Underwood Spec .................... 14.75" (from 2.7" P32) - The XTP expanded fully, but wasn't measured. I estimate .40" - .45". His comments about the Underwood cavitator ammo performance compared to the XTP: - "Temporary wound cavity was definitely more pronounced." - "Penetration was 3.5" - 3.75" more." - "It did more soft tissue damage in the temporary stretch cavity." Reliability All ammo functioned 100%. Comments These bare gel penetration results are very close to that obtained by FourGuysGuns, which was discussed in the thread at http://www.thektog.org/forum/f86/2nd-gel-test-32-underwood-cavitator-sp-p-266641/ Their CZ VZ61 4.5" barrel achieved 19" penetration -- comparable to the 18.5" from this Mauser's 3.4" barrel. Interestingly, their .30 Carbine test result with an M1 was also virtually identical to MAC's recorded penetration of 24" - 25". Since MAC's test correlates extremely well with FourGuysGuns, it gives additional support to both FourGuysGuns test and Jeremy S. tests with the shorter 2.4" barrel Beretta Tomcat. Jeremy's test was discussed in this thread http://www.thektog.org/forum/f86/gel-test-32-underwood-cavitator-vs-gold-dot-vs-fmj-266374/ The gel depth penetration of the Underwood Cavitator ammo from the Beretta Tomcat is comparable to FMJ's and 4" - 8" deeper than fully expanded JHP's from 2.4" - 2.7" pistols. Width of wound track is larger than fully expanded JHP's and much, much larger than FMJ's. IMHO, this is all further confirmation that the Lehigh Xtreme Cavitator bullet, particularly in the Underwood SP and +P loadings, represents a very significant improvement in .32 ACP self defense ammo.