I kinda thought the slugs might be light on penatration, I have no experience on game with them , I did shoot an aluminum casing with on once , it went through 3/16ths aluminum no problem but how that relates to game I have no idea , I did try some 3” shells loaded with 5 .310 rb , I only loaded 3 or 4 but they seemed to patten about the same as bird shot , I like the idea of your bigger buckshot a lot better ,
For now the bears are napping so is something to figure out for next year