Several years ago I went to a scrap yard and cut the web from the middle of a 36 inch I-beam. Then I took it home and fashioned two buffalo targets. They came out about 18 inches high by about 24 inches long. Then I fabricated a couple stands for them. As they're built as big swingers they don't require resetting and have been left on the range for years. We've shot them out to 500 yards. They don't move a lot as they are quite heavy, maybe 60 lbs, but they make a satisfying "thunk" when hit with a soft lead projectile. You won't hear it past 300 yards. If painted white you also see a white dust cloud from both the paint and the bullet disintegrating.
That's been 15 or more years ago and we still shoot them. They show little wear as they're 3/4 of an inch thick. Jacketed bullets aren't allowed on these mild steel targets as they will destroy them.
I've shot all the other targets mentioned and I believe all of them are great fun! Rocks, (which we have no shortage of!), set up on top of my target frames are a lot of fun also.
Vic