I run Terminal Ascent. However 300 WM 200 grain bullet with s.d. 3 compared to 7 mm PRC 170 grain bullet s.d. 3. Using a 20 mph wind at 500 yards there is a 2.8" difference in drift in favor of the 7 mm.
I guess they made a 300 PRC 215 grain TA bullet but no longer available? When I compare that bullet to 7 mm PRC the 7 mm PRC 170 grain bullet the 7 mm has 1.5" less drift. Both have s.d. > 3.
7 mm PRC 155 grain bullet 2.75 s.d. compared to 30-06 175 grain bullet s.d. 2.64 there is a 7.5" difference in drift in favor of 7 mm.
I run 2 30 cal and I have had great results. When I run the numbers with the bullet I use the 0.284" comes out on top regarding drift. Personally, I don't think I will feel less gunned with a 7mm when compared to a 30 cal.
I love to hunt pronghorn which means lots of wind. Any advantage in the wind I'll take it. I would have no issues using a 7 mm on elk.
I'm currently in the market for a rifle. I have been running a lot of ballistics as of late. When I run 6.5 CM, 6.5 PRC, 270 WIN, 270 WSM, 280 AI, 7 mm RM, 7 mm PRC, 30-06, 300 WM. I didn't run 300 PRC b/c TA doesn't currently offer. But....7 mm take the top 3 spots for lowest wind drift. For me, since wind is the variable I have the least control over, it has become the variable I pay the most attention to when I'm comparing cartridges that I'm interested in.