If you haven’t gone too far with the load development, I’d suggest trying the 140 grainers. The SSTs have a rep for blowing up, but I found the heavier-for-calibre variety to be good.
Loading with 2213sc, can’t remember charge sorry but they were doing about 2840 fps from memory out of a 24” barrel. A bit slower than you were getting, but countered by a higher BC and the slower speed possibly also helps them stay in one piece.
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