A 160 woodleigh has a dismal BC for its weight. Maybe good for still hunting, but not something I'd label "ideal for western hunts." 123-142 class bullets offer higher speed and BC.
Uh, what? Woodleigh #80A - 160gr spire point. G1 BC of .509. It'll work just fine. Maybe you're thinking of the round nose?
The ballistic calc says a +-3" MPBR of 300y and it stays in the velocity window for 560y. That's at sealevel. At elevation, it'll just get better. I think it would hunt the west remarkably well. Show me something with the same sectional density and more reach, and I'll bet it has a LOT more recoil.