I got my $15 rebate check in the mail today from when I bought 5 boxes of Norma NXD ammo in .45 Auto caliber. I would have bought .380 Auto too if it was in stock, which it still isn't. They have the other 6 calibers, but not that. You could get up to $90 back IIRC, by buying multiples of 5 boxes, but I just wanted to try 100 rounds to see how they work in my guns.
The NXD is defensive ammunition that uses a fluted, non-expanding projectile similar to the Polycase ARX Inceptor round introduced in 2015. The NXD projectile is made of a copper-polymer matrix featuring a full-metal-jacket (FMJ) profile, but featuring specially engineered flutes. Combined with a high rotational velocity, the flutes leading to the ogive exploit two fluid dynamic principles: Hydrodynamic Ram (HRAM) and the Venturi effect.
When a high-velocity bullet enters a fluid medium, HRAM will cause a large cavity to form. The mushrooming of a hollow point bullet increases this effect. The fluted NXD bullet works differently than a jacketed hollow point (JHP); cavitation still occurs, but as Norma’s Vice President of Portfolio Management Daniel Cox explains, “The NXD takes it much further in utilizing the Venturi effect to create multiple secondary Hydrodynamic Ram events in soft tissue. This increases shock value and soft-tissue disruption.”
The use of eight flutes — as opposed to four flutes seen the similar ARX non-expanding composites — “allows for a more effective utilization of the Venturi effect,” according to Norma, “and helps produces a longer and larger wound cavity.” These flutes have the additional property of not being susceptible to clogging as many JHP bullets do.
https://normausa.com/product-category/dedicated-defense/nxd/?orderby=price