Oh, we can get at ear levels well below that of a .22 WMR unsuppressed using well made full size rifle cans. More like 24" barrel .22 LR. Our 1.6x8" Accipiter 30 puts down 128 dB at shooter's ears on a 20" .308 with 150 gr ball ammo. That's 3rd party metered on the B&K Pulse system. Other top teir cans of similar size perform similarly.
The crack of supersonic rounds varies tremendously, though. 115 gr 9mm rounds are actually more offensive than high velocity rifle bullets. The shockwaves propagate differently and at different distances from the shooter with slower, larger, more blunt bullets. 10mm Auto with the wide, typically truncated cone bullet shape is just awful. Meanwhile, .17 Rem with its tiny, aerodynamic and extremely fast projectile exhibits very little crack to the shooter.
Environment matters, too, whether or not that sound is reflected. If there are nearby land features, rocks, trees or especially structures to reflect the sound, you're gonna perceive higher levels than in a wide open field.
130 dB as a constant noise is very loud, of course. But not so much as a few millisecond impulse noise. Think of it in the vein of swiping your hand over a flame quickly versus holding it there.
Semi auto hosts with port noise and piston pop are another matter, gas operated rifles simply won't get below the high 130s dB range if they're cycling, most will be in the 140s. But this thread is about bolt actions, so I won't get into that further.