You will find, that on Elk, Moose and bear, the pure lead balls will exit, as they have on about 15 moose so far. That is a .735" ball ahead of from 130 to 200gr. 2F froma .75 cal rifle. The fellow shooting this rifle dropped his load to 100gr. just to keep aball inside a Bull Moose.
: Now, the beauty of a large bore, slow twist rifle with .008" deep rifing, is that it will also shoot WW balls running 10 to 13 brinel just fine. You may have to adjust your patch for ease of loading, but with the wad separating the powder charge from the patch, a thinner patch should be just fine. Use enough BP lube on it, and go for it.
: Sand does no equate to meat, ribs and lung tissue very well.
: My bro put a .735 ball from a Brown Bess through to the off side of a big cow moose, using 100gr.2f. The ball expanded slightly to 1" in dia. after cutting through ribs on both sides.