Don't you think 75 gr in a .54 will give me a humane kill out to 70yds?

Keep in mind I use Swiss which is very close in power to T7.

I'm looking at a ball I recovered today. The backstop is what looked like 1" plywood. At the 100yd target it blew through that and buried in the dirt pretty deep. A nice mushroomed ball that looks like it retained most of it weight.

I think at 70yds or less it will pass through what i'm hunting for, and expand like round balls do. I'm comfortable with the load to do it's job.