so what did the other 7 do when you shot? is the gun quiet enough that they will stand around and let you shoot at them again?
for whatever little I know about it...I know when suppressing rounds...its not uncommon to load them down to slower ballistics....bullets that are travelling abnormally too fast or slow are more prone to do erratic things.
I had some extremely managed recoil loads that we put together for a .270....muzzled at barely 2000fps....they behaved strange as well.
So, when I took the shot, the 2 or 3 that were nearest to her took off like a shot. The others that were in the area hesitated, ran a few feet,then looked back, then looked around, then took off. They were very confused. The un-suppressed shots I've taken in the past, the other hogs just make a flat out sprint away from the area. So, in my only experience so far, it slowed their flight just a bit. But, could have just been a fluke.
I think even if you were shooting a subsonic 300blkout, they would still have a somewhat similar reaction. Probably be a good question for TexasLawman. I'm sure he's going to have way more experience killing hogs suppressed than I do.