Best Firearm Cartridge and Favorite Firearm Cartridge

What is the best current cartridge on the firearm market today? Which is the best caliber?

Is it an intermediate cartridge, a pistol cartridge, or a full-powered rifle cartridge? What are the ways to determine what is the best? Is it the flattest-shooting? The best penetration? The best for hunting? Which aspects are most important when making this determination?

And also, what is my personal favorite?

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The Blind Sniper: https://www.youtube.com/@UCAT7Pn6H6Ya6vgAtHwBmI9g

8mm Mauser Man: https://www.youtube.com/@UCMoupv7Y25CvqsMF4HR4y7Q

Hobo Factory: https://www.youtube.com/@UCOcqzudLqeopDH_IUjI2FpA

Joe Morgan: https://www.youtube.com/@UCyiEI9xV1DpN3WDt2UxOPeQ

Arisaka Type99: https://www.youtube.com/@UC_2bEiG2zSCJ16xGHVpjauA

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