I'm thinking this may have been the issue.
I have shot three pigs in my life, many years ago. Got one and a day later two. Was asked to go pig hunting and decided to take a Super Blackhawk
in .44 mag. The guys that asked me to go suggested the 870 12 gauge with slugs and buckshot, I took both. Hunted with the 12 gauge day one and had
a clean miss at about 10 yards at a low flying pig in heavy cover with two slugs fired. Shot one later that day broadside through the shoulder, it flopped around a little but went nowhere, about 150 pounds.
Next morning hit one coming towards me maybe 20 yards away, it decided I was better off dead, second shot got a front shoulder ...skidding pig temporarily but still making some headway to get me, third round killed it.
At that point I loaded one slug in the chamber followed by buckshot. Later got a shot at another flying pig, another miss with the slug but
maybe three hits with the buckshot did the trick.
In that kind of cover any future pig hunt for me will be all buckshot.
Pigs can motor along pretty quick through heavy weeds and brush, at least it seems like it when they're close to you.
Oh, they are nasty things to dress out!