My old man used them several seasons back in the 2000s. They left very big holes, both entry and exit.
Aside from the cost and recoil, another crappy thing about shotgun slugs is different styles seem to come and go pretty fast. A lot of times you'd find a really good shooter, only for them to promptly be discontinued.
We're limited (30+ caliber straight walls plus a few short bottlenecks) rifle now, and I'll frankly miss any slugs about as much as a toothache.
