Got ya on a mission there I see. lol
Any type of very small aggregate would be fine to mix ,the key is what will go through the fill hole spout on the bags. I would try the Chromite on it's own, you can always pour some back out and remix.
Once you use the bag and the leather stretches a bit you'll need to adjust the fill anyway most likely.
Fill em, shoot em, see what happens.
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