Doug Huffman
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Many individuals or categories?sophiecentaur said:@ Danger: There must be many man made projectiles that travel at >Mach 5. That's all you would need.
The first generation of .17 (caliber) Remington rifle rounds were rated as 5050 fps but were de-rated in about ten years to 4000 fps for being too difficult to maintain. I brushed lead and gilding metal from my rifle's barrel each five rounds.