223 will be the hardest on the plates at that distance. Personally I wouldn't shoot any of them at 50. 200 should be fine as long as your hangers allows some movement of the plate to absorb some of the intital energy.
Talk to cowboy06 on here. He makes plates and stands and have been thoroughly tested.
Certainly don't buy the 3/8th thick one - its only for pistol calibers.
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