Might be a tooling thing. Suspect lots of companies are already set up to make standard size BB's than specialist HIMARS versions.
The smaller size has a much higher lethality/hit rate on equipment in the area. Remember as the size of the shot increases, the actual number of shots it can hold decreases at a higher proportion.
So a doubling in size doesnt mean half the shots, it means like a quarter or less. The whole idea behind these rounds is to shred infantry and light equipment in a large area, not penetrate armor / bunkers. They have a different round for that.
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