I received today an order from Underwood ammo out of Charleston, WV which had some 9x25 Dillon ammo loaded on reformed 10mm cases. I was surprised to see a headstamp of: UNDERWOOD 10mm from a small manufacturer that otherwise uses Starline or other generic brass for everything. 10mm is their premier caliber offered, sort of like Double Tap ammo in that regard, and so this might be their only custom headstamp. I sent an email inquiring about other calibers.
Underwood was one that I mentioned a few weeks back when referring to the Lehigh Defense “Xtreme Penetrator” ammo, and how Underwood appeared to be the first manufacturer other than Lehigh to offer this projectile type for sale. At first they were doing 10mm only, but are now doing a range of calibers for the Xtreme bullet, and all other Lehigh bullet types. I ordered some .460 Rowland in this same order with the Xtreme bullet which arrived on .460 Rowland brass.