O,K. - a little research with the right person and I have received this information about Rhino Replacement Parts.
They started making ammunition c.1986. They market some weird loads in shotgun, one called “Dragon’s Breath.” It is so ridiculous I won’t even quote the description on this Forum. They made other shotgun shells, including flechette rounds.
For Lew, one telling bit of information: The made “…in centerfire ammunition Arcane AP…” Their line offered centerfire metallic ammunition in calibers .380 ACP, 9mm, .38 Special, .357 Magnum, .44 Magnum, .45 ACP, .223, 7.62 x 39mm. .308 and .30-06.
Now, the bullet weight of Lew’s round is still “iffy” for me to be a U.S. load. However, hopefully, someone can come up with some sort of Rhino specs sheet that will list the bullet weights they offered 9mm in. If they offered one of the same or similar weight in the “Arcane”-shaped bullet, then I think we have an answer on that.
Rhino ceased operations at the end of 1990.
Reference: Rhino Replacement Parts Seneca South Carolina (US-2132) Forensic Ammunition Service.