(Part 2) 300 Blackout 7.5" vs 16": Does Barrel Length Matter?

Underwood Ammo
300 Blackout 194gr Maximum Expansion (Subsonic)
Muzzle Velocity: 1025 FPS
Muzzle Energy: 453 FT-LBS

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PLEASE NOTE:
All filming is performed in a controlled environment, on a private range, by a trained professional. The video and any content is performed safely and supervised by trained professionals for your information and entertainment. Please do not attempt this at home.