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Cartridge : 12 gauge Sabot Designs Flechette Sabot (19 flechette cartridge)
Firearm : 12 gauge 3.5" magnum shotgun with 24" barrel length and cylinder choke
Block calibration : All depths corrected (Block was within calibration tolerance 7.8cm @ 575 ft/sec)
Single shot fired at 7 feet distance. Average impact velocity was 1931 ft/sec. Of the 19 flechettes that impacted the block - 3 experienced severe yawing and exited the sides of the block within 6" of penetration, 9 penetrated 15.8" of ballistic gelatin then 12" of polyester bullet arresting box (which in my experience is roughly equal to 16" of ballistic gelatin). These 9 flechettes traveled with sufficient velocity to utilize the stabilizing fins as wounding structures until an average 11.1" penetration depth. This cracking should be evident in the second photo below.
The remaining 7 flechettes exited the sides of the block sometime between 6" and 12.0" penetration depth.
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