ordering from Russia was fast and easy. They have much better prices when you order direct anyways.
At one point I had 6 russian slug and round ball molds.
You should find good results from the match slug although it casts a little large and is hard on wads. Personally only had luck with the heaviest slug and cast of wheel weights. Softer lead and deeper skirt caused the skirt to obturate way too much and shear thevwad pettles at the base of the shot cup. I found the accuracy erratic and inconsistent.
With the smallest base pin and water dropped wheel weights I could manage 4" groups at 50 yards consistently sometimes cloverleaf groups mostly not, and often you will get a slug that will shear its petals and go squirley.
I found modeling clay filling the base works just as well as hot glue to support the skirt and is much cleaner and quicker to do. Trim the wad petals about half way along the front driving band. Put your wads in a bag with a tiny bit of powdered graphite, it helps the slug release from the wad.
To get good results from a smoothbore everything has to be exactly right 100% of the time or you will be disappointed
Its half luck and half magic, but lots of fun and rewarding once you find the right combo.