Looks like we got another arm chair ballistics expert on our hands charlie.....
where did you get that data sniper??? from your exterior ballistics software?? software is not reality.......
before you go off telling me whats what........ My ears would be a little more open if you could tell me that wind drift data was from one of your shooting log books. I log all my handloads and most or there exterior ballistics if I am happy with a loads accuracy. I will tell you straight up with my experience with lost river J40 190 grain match bullets (BC is .774) and my sporterized Springfield 03-A3 ( glass bedded walnut stock, jarden trigger, shepherd 6-18x40 scope). I'll put my rifle up against any rifle of your choice in a 600 meter match you just name the time and place.

by the way the 338 cal 250 grain J36 has a BC of .661, your 7 mag with a 160 grain bullet..... (sierra doesnt make a 160 grain pro hunter) probably the best BC for a 160 grain .284 cal bullet would be a nosler partition even then its BC is only .475, a 7 mag pushes a 160 grain bullet around the same velocity as a 338 RUM with a 250 grain bullet so from experince with the J36 bullets I would flip flop your numbers around that would then make that 338 load to have better wind resistance then that 7 mag load. but either way those numbers you posted are very marginal and are not nearly enough to say one is better then the other for windy conditions.