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Yeah correct great powder as it full’s the case while still keeping pressure and speed low as its for cowboy shooting
Other options for subsonic loads require fillers as there’s such a small amount...

Trail boss powder not sure how much
But plenty of data online

https://youtu.be/P5dve7vAY9I This video shows the advantages of a large slug in the sticks
Obviously you wouldn’t want to shoot though quite as much as he did if you were shooting a deer for real

I wouldn’t go for a semi for bush shooting infact personally for me I don’t like semis for hunting full stop
I know some do and that’s fine this is only my opinion
I don’t like the idea of hunting...