I just today noticed some new & interesting triplex ammo in 38spl. This type of load hasn’t been marketed by any manufacturer in years in pistol calibers, and most of this type of stuff was only around in the 70’s and 80’s. Today the only equivalent would be the .410 stuff made for the Judge pistols, like the PDX1 that Winchester makes.
Anyway, the company is Constitution arms, and the guy (Matthew Carmel) is the creator of a new palm pistol, and these triplex rds just came out for it. He only ships straight to FFL dealers, but he will do individual packs:
http://www.palmpistol.com/triplex.html
The spec sheet is here:
http://www.palmpistol.com/links/TriPlexSpecification.pdf
It is was built for, and intended for his Palm pistol or any little Derringer type gun since it is low recoil. The lead projectiles are nickel plated, and the bottom one has a copper gas-check. I spoke with the owner today and he said he will have some video done on Monday. He said that packs will ship as ordered and get out in about 2 weeks.
Looks like this: