This video from Banana Ballistics provides an expert-level comparison of 5.45x39 and 7.62x39 cartridges, focusing on their mild steel penetration capabilities. The host, an independent ammunition tester, uses a chronograph and digital calipers to gather precise data, demonstrating that while both calibers can penetrate 1/4 inch steel, neither standard FMJ nor steel core variants fully penetrate 3/8 inch mild steel under the tested conditions. The 5.45x39 with 7N6 ammunition previously tested showed superior penetration.
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