I just got back from the NRA Annual Meeting in Houston this morning. D Dupleks had a display of their various slug loads. What they are offering in the US (through Century Arms, according to the guy in the booth) are a “match” load with a pointed steel slug (I did not know that there were shotgun target matches, but why not?) in 12 ga 2-3/4", a frangible cylindrical slug, which is lead shot in a plastic matrix, apparently for shooting popper steel targets, also in 12/2-3/4", two different but similar steel slugs, waisted flat point, 440gr or 495gr in 12 ga/2-3/4" and 12ga/3" respectively, 385gr in 16 ga/2-3/4", and 300gr in 20ga/2-3/4", and a pair of really wicked-looking expanding slugs, DUPO 28 (does not shed petals) and HEXOLIT 32 (sheds petals), the former in 12, 16, 20, and 28 ga, the latter only in 12ga/3" and 12ga/2-3/4". And I didn’t even know there were Latvian shotshells.
Their website is: ddupleks.com