Looks like super shorty no longer available.....rem 870 tac is though. I have a mossberg 500 with a short slug barrel that'd prolly work but that 870 tac would handle so much better indoors.
I prolly wouldn't choose that leverevolution ammo either....the only reason to use it in a lever is increased accuracy at distance and I'm not shooting anything outside 20 yds. with that thing.
We'd need one of the ballistics guys from the enfield to verify that.....I'm not sure you want that projectile for a griz but I could be wrong. Griz skin and deep tissue is a LOT tougher than a scrote's.