Jack of all trades gun?
I think the general rule is 1x for every 100 yard, so now I see the 8x requirement. Based on your choice though why not go with a BDC and match it to the ballistics of the 75grn? I think Leupold can cut you a custom reticule.
It almost sounds like an rds coupled with a 2-8 or the common 3-9 is the ticket here.
Btw, have you checked on the Brian Enos forum what the cool kids are running?

I hope I am not coming off argumentative, that's not my intention. I find these topics fascinating, plus I have been wondering about this myself so want to see what you come up with.