Sonic boom is sonic boom. I’d guess Mach 3 ia a louder boom than Mach 1.7.
M114 155mm Howitzer - Muzzle velocity 563 m/s (1,847 ft/s) (Mach 1.69)
8 in Gun M1 - Muzzle velocity 866 m/s, Mach 2.6
I would not want to hear the sonic boom of a hyper-velocity, two foot long solid projectile, at sea level. I have heard the ‘pop’ of meteors entering the earth’s atmosphere, and they are usually doing in excess of 11 km/s. But they are usually the size of a pebble..............