This video showcases the 4mm Swiss M20, presented as the smallest round in the collection. It's compared to common calibers like .22 LR, .308, and .50 BMG, highlighting its diminutive size. The 4mm M20 is noted to be primer-powered due to its small bullet, making it a unique sub-caliber training round.
This video provides a visual comparison of ammunition sizes, starting with the smallest rimfire cartridges like the 17 HMR and 17 Mach 2, and progressing through common pistol and rifle calibers up to the massive .50 BMG. It highlights differences in bullet size and case capacity, demonstrating the vast range of ammunition available.
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