Two things...
No, three...
1) "It looks like NJ is an anomaly." NJ is ALWAYS an anomaly. No matter what the discussion, NJ is always an anomaly. I lived in NJ. Things there were different than any other place on this planet that I have visited.
2) What Eye appears to be looking for is personal information from people familiar with each state's laws that those states do not have laws that ban hollow point, or expanding, or whatever other term they choose to use. (Not looking for laws that allow them...)
3) Searching for "hollow" will not find "frangible" or "expanding" or whatever. Laws might be written in any number of ways that do not specifically reference "hollow" point bullets. The treaty referred to earlier does not mention hollow points, but bans "expanding" bullets, which would cover even those designs that do not have hollow points...
The laws might even be written to specifically state what is lawful to use rather than taking a chance on missing something they don't like by not using just the right term when trying to ban something.
For example, ban only "hollow points" and that allows those bullets that have a nylon ball in their nose, keeping it from being "hollow." (It also misses the Glaser's Safety Slug frangible bullets, and all the other stuff that isn't quite a "hollow point" round.)
OK, back to the collection of data!
AL: Legal.
AZ: Legal.
CA: Legal.
CO: Legal.
CT: Legal.
FL: Legal.
KY: Legal.
ID: Legal.
IL: Legal.
KS: Legal.
MD: Legal.
NC: Legal.
NH: Legal.
NJ: Regulated to effective illegality.
NM: Legal.
MO: Legal.
SC: Legal.
TX: Legal.
UT: Legal.
VA: Legal.
VT: Legal.
WA: Legal.
28 States and DC haven't had answers posted yet. It looks like NJ is an anomaly.