Where STW really shines is with heavies. I played around and settled in on 175 with big doses of R-26 I downloaded to 3000 fps just for ease on ballistic calculators. BC of .660 reaches out there!
In the past 30 years I've seen a Bull at 100ish yards stop a 175 out of a 7mm rem mag on a broadside classic heart lung shot. I think that it was a Speer bullet. I've always had pass through shots with the stw.
Your bullets will be fine. I don't believe in 140's game hunting. Way too much destruction. The 160 and higher have the sectional D to punch through.
7mm .284 175 gr ELD-X™
Ballistic Coefficient (G1) .660
Ballistic Coefficient (G7) .330
Sectional Density .310
7mm .284 162 gr ELD-X™
Ballistic Coefficient (G1) .613
Ballistic Coefficient (G7) .308
Sectional Density .287
ELD-X™ Extremely Low Drag - eXpanding