That "both barrels" happened to my Dad when he was a kid. Running beagles with a borrowed 10 ga, he had both hammers back waiting for the rabbit to come around. It did, and he fired. Yep, both hammers dropped. Knocked him over.
My "worst" isn't exactly a rifle, rather a Rem 870 with a slug barrel. It shot Brennke "KO" slugs surprisingly well, but I dreaded sighting that bugger in. I shoot .338 Win Mag and recently 9.3x62, both from 8 lb rifles. I'll take a 60 round load workup in a T shirt with either of those over that shotgun.