20” seems to be the point some calibers really start barking. I’m with some others opinion that pitch makes me cringe as bad as the decibel level on some.
My 20" barreled 243 is "crackier/blastier" than my 20" barreled 308 which has a heavier boom.
Unless my math is bad, which it could be, a 20” .308 is equal to a 32” .243 based on volume of the barrel available for powder burn. That’s assuming equal burn rates, etc etc.
