Never heard of this Company. Not saying it's bad - but for SD/HD I'd go with a product time proven and street proven. WHY would you want to risk life to an unknown factor?
The Buffalo Bore 158 grain +P LSWCHP-GC (#20B/20) at 1,040 fps. out of a 2" snubby is very serious medicine! My actual chronograph tests at my Range were over 1025 fps from my M60-7 2" revolver. IMHO it's one of the very best in the 38 Spl. category. Yes - you will pay the price with recoil and it's expensive enough that you will not be using it for informal target shooting, but for its intended purpose I don't know of anything better if you can deal with the heavy recoil out of a J Frame.
The second choice would be the Speer 135 grain Gold Dot HP +P. While not as hot, not as fast and not as heavy, it still seems to have a great track record. The recoil is not as heavy as the BB load either. those would be my SD/HD choices in 38 Spl. I know absolutely nothing about the new load from Steinel.