This video tests Silver Bear 55gr FMJ 223 ammunition in a short-barreled AR-15 using a recycled gel block. The test reveals the bi-metal bullet's construction (soft steel core with copper wash jacket) and zinc-plated cases. While not ideal for self-defense due to minimal deformation and fragmentation, it's considered a viable option for 'SHTF' stashes, demonstrating reliable feeding and significant tumbling in gel, reaching a final depth of 21 inches.
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