Here we go again...
This time I will try to combine a sabot slug with a Brenneke helical profile to get a slug that is as simple as possible - yet reasonable accurate. I have had nothing but positive experiences with my Brenneke clone with injection molded wads. By adding the helical ribs to the wad instead of the slug, the casting of the slug will be faster and more simple as it can be done in a "normal" mold. Also, the slug has a spigot instead of an internal cavity and should hold up better when hunting dinosaurs.
The two parts are meant to be pressed together with considerable force - no glue or screw. The reason for the square spigot/hole is just in case I later would want to make a plain wad without ribs for rifled barrels - then the square shape will keep the slug from rotating in the wad.
The combined wad/slug is rather short and lack any form of sealing and crushing in the wad. I have yet to find anything better than the x12x seal for foundation when stacking a slug load so this what I'll use here.
Notice the rather pointed nose on the slug. While it no doubt results in a better ballistic profile, I hope it will improve the airflow over the front of the ribs and help to induce some extra spin in the slug. The pointed shape should also move the drag a bit further down the slug to improve stability (my previous sleeve-slug design became extremely unstable when crossed with a pure flat-nose slug)
This is what the wads look like so far. Next step will be to make the mold for the slug.