So, question to the group:
.308 Ruger Scout Rifle, .300 Win Mag, AR or AK, or just .22-250 in the gut so they run away from the feeder and die?
Given the current political climate and the amount of loudly spoken complaining that has gone on, especially for some of the newer or less popular calibers/ammo being in short supply, I would suggest traditionally common calibers. When shortages do occur, they seem to be the ones that recover the quickest.
2). Found too many now that have been shot before and survived. They are tough sob's. So unless you find the body it's not 100% dead.
Shot a boar through the shoulder with a .45-70 at less than 100 yards, dropped in place, did the dirt dance, stilled, so I climbed out of the stand to claim my prize only to have him get up and run away...never did find him. He probably died soon enough, but with no body then no body count. I now wait longer before leaving the stand and had another hog get up after the dirt dance, but I was ready for him and a second shot nailed him to the ground about 10 yards from where he was "killed" the first time.
A buddy of mine big on the notion of "bring enough gun" had a deer under the feeder at 45 yards when he shot it in the leg with a 12 ga. slug. Needless to say, the deer ran off and the feeder now lists a bit to the side, the leg just bent some from the impact. You can't bring enough gun for a decent kill if you can't hit the intended target.