i suck spent caseings at calling wind haha drop is much easier for me to deal with, so i prefere the heavy less drifting rounds
I have to agree with Kevguy.
From a theory stand point, 155 gr have less drift AND less drop at all practical distances.
You can punch out a 155 Lapua Scenar at 3000 fps. But, as bullet weight goes up your case capacity goes down and you have to worry more about pressure. So most heavier bullets are lucky to see 2700 fps from a .308WIN.
I did up a test load with 220SMK's, but I could not get them moving any faster than 2400 FPS. With it moving so slow, it only starts to gain on the 155 scenar once you pass the 1000 yard line.
Heres some numbers generated on JBM:
155scenar 3000fps @ 1000 yds = 307" drop and 98" for 10 MPH Xwind
175SMK 2700fps @ 1000 yds = 389" drop and 115" for 10 MPH Xwind
220SMK 2400fps @ 1000 yds = 433" drop and 98" for 10 MPH Xwind
155scenar 3000fps @ 1700 yds = 1680" drop and 368" for 10 MPH Xwind
175SMK 2700fps @ 1700 yds = 2037" drop and 399" for 10 MPH Xwind
220SMK 2400fps @ 1700 yds = 2030" drop and 337" for 10 MPH Xwind
I guess this explains why the TR guys are happy to use 155's all the way out to 900 meters. With an extra long barrel they can get them moving faster than 3000 FPS and have even less drop/drift to worry about.