Ok. We're not hitting the chains or the frames. The steel they supply isn't very large, I'll give it that. About the size of basketballs. But we are hitting the targets just fine.
Thanks for the help, guys. I will probably talk to him about purchasing some stands that we can use instead of using the hanging targets from here out.
The times I've shot in matches they had spring boards, and there was a guy who made them. I haven't talked to him in a few years since I stopped shooting in the matches. What he made wasn't strong enough to hold up to larger rifles, his only could withstand up to 5.56 (otherwise the springs gave out). It doesn't seem like I can make one that is strong enough to do what those did for large calibers. So I'll have to invest in something that we can just dig into the ground and replace the backing as needed, avoiding the hanging targets altogether.
I wouldn't rule the hanging targets out completely just yet. From what you've said it sounds like the chain is the part that's giving out the most, no? I'd try switching what you use to hang them before anything, I'd still bet that a steel cable would hold up better than chain.
If spelling is chewing up the frame too fast, it may be worth it to increase the size of the frame. If you've got a 3x3 square frame with the target in the center, logic says that a 5x5 square frame with the same target will have the fragments of the bullet moving slower by the time they hit the frame, doing less damage.
You could also dispatch the need for frames or holders all together:
Throws in the fun of a target that changes location and distance. 3/8 ar500 is rated for rifle calibers at 100 yards if memory serves, least the ones that aren't super heavy hitters (300 winmag, 338 lapua, 50bmg, you know what I mean)