My findings at home or on the internet photos/posts......
It's a hard bullet known for penciled punch-thru holes, unless shot with below magnum powder charges. Better chance of opening using 80-100 gr. volume blackpowder / Pyrodex. Works better with 80-95 grains volume of Blackhorn 209.
In my opinion, I prefer the 300gr Hornady XTP in 44-cal, possibly the best all-around bullet in it's inexpensive price class. . That 300-bullet is very deadly and more forgiving, in terms of bullet speeds and impact. You can purchase them in bulk, along with Harvester regular or crush-rib sabots (green)..... whichever fits your bore best.
Loading the bullet should meet a little resistance going down the bore. If grunting / heavy forcing occurs, switch to the crushed ribs. Seat the bullet firmly, especially using Blackhorn.
Don't attempt removing the tips of the SST to create an XTP bullet. That SST 300 is likely a bonded bullet and it still fails to open properly with tip removed, in way-too-many cases.