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High-speed video has emerged as an valuable tool for quantifying bulletperformance in ballistic gelatin. This paper presents the results of testingfour .357 SIG bullets using high-speed video of bullet impacts in ballisticgelatin to determine retarding force curves, permanent cavities, temporarycavities, and energy deposit vs. penetration depth. Since the methods areidentical, results are meaningfully compared with four 9mm NATO bullets studiedin an earlier project. Though .357 SIG bullets perform slightly better due tohigher impact energy, the principal finding is that there is a much biggerdifference in performance between the best and worst performing bullets in eachcartridge than there is between bullets of similar design in the twocartridges. In each cartridge, higher performing expanding bullets (jacketedhollow points) outperform non-expanding bullets (full metal jacket) by a widemargin, showing a much higher probability of rapid incapacitation according toan Army Research Laboratory model by Neades and Prather (1991).

Comparing Terminal Performance of .357 SIG and 9mm Bullets in Ballistic Gelatin Using Retarding Force Analysis from High Speed Video