Wikipedia is a convenient source of popular knowledge. You could be an expert in language arguing until you're blue in the face that "literally" does NOT mean figuratively, but when enough people use literally in figurative manner that figurative definition literally becomes acceptable to lexicographers.
And since we're well past weaponizing Aspergers here, why are they called hollow points? You cannot have a hollow point - it is "literally" an oxymoron...
Perhaps the only thing less convincing than appealing to authority is making ad hominem attacks. But since we're appealing to authority, I'd wager courts would assume a Merriam Webster definition more closely matches the intent of legislators than a definition from an expert no one outside the gun community knows.
dumdum: a bullet (such as one with a hollow point) that expands more than usual upon hitting an object
https://www.merriam-webster.com/dictionary/dumdum
Or maybe you prefer the Cambridge English Dictionary:
dumdum bullet
noun [ C ]
UK /ˈdʌm.dʌm ˌbʊl.ɪt/ US /ˈdʌm.dʌm ˌbʊl.ɪt/
(also dumdum)
a bullet with a soft front that increases in size when it hits someone, causing serious injuries
https://dictionary.cambridge.org/us/.../dumdum-bullet
Or how about the Collins English Dictionary:
dumdum (ˈdʌmˌdʌm)
n
(Firearms, Gunnery, Ordnance & Artillery) a soft-nosed or hollow-nosed small-arms bullet that expands on impact and inflicts extensive laceration. Also called: dumdum bullet
[C19: named after Dum-Dum, town near Kolkata (Calcutta) where these bullets were made]
https://www.collinsdictionary.com/di...english/dumdum