I dunno. I used to shoot my .22 in my basement (against a big stack of phonebooks, which always did a good job stopping the bullets) and it was pretty fuckin' loud, even for a basement. If it's a relatively empty van (not shielded to absorb noise, as it may be), then I can imagine the sound being pretty substantial. Also consider that a .223 packs a much larger charge than a .22, so it's a fair bit louder.
I haven't shot a .223 in my basement or anything, but I'm guessing that in an enclosed space, it will definitely make your ears ring.
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