The attached photos are of the commercially imported (now discontinued) PMC Ultramag, with 66gr and 110gr tubular copper bullets in .38 Special and .44 Special, respectively. Case stamp for each is “38 SPL +P PMC” and “44 S&W SPL PMC” The bullet design is basically from Flatau. The visually similar GEA tubular bullet has been detailed elsewhere.
I used a ‘kinetic’ bullet puller to pull the projectiles for photos. Interestingly, attempts to pull the plastic obturator from the case resulted in a broken bullet puller. I did break an ASP once, so this surprised but did not shock me. The obturators are in place in the photos. If I ever manage to get them out (probably by destroying the case) I’ll photograph them.
The .44 Special Ultramag has been a ‘white whale’ cartridge for me for a long while now. The .38 Special version seems to be much more common; I was able to find a full box at a gunstore around 1999. The full box of .44 Special UM was the first I’ve seen for sale. Hopefully the photos prove to be of use.