Couple thoughts here....... Someone correct me if I'm going the wrong direction.
I've had half dozen cases split pretty similar with light loads in .32 H&R. FTR, cases were Starline brass, load is 2.0 grs TiteGroup behind a 98gr RNFP. I had always figured it was brittle brass that may need some annealing until I realized I never had issue with medium loads on up. Too the best of my knowledge it appears to be a combination of low pressure and "slightly" brittle brass not allowing for proper expansion of the case.
Now I'm not sure how you're Universal load compares to my load in burn rate or pressure but can tell you mine is basically a .32 long load in H&R cases. Never the less, I wouldn't worry about one, you start seeing em consistently and I'd either anneal or toss the cases.
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