Unless you're planning to only shoot elk at longer ranges, I'd be more included to use the heavier LRAB (which which weighs 142 grains) or the standard 140 AccuBond in the .264. How far do you usually shoot?
I have used the 129 LRAB on deer, but so far from milder 6.5s than the .264, the biggest my 6.5 PRC. But I am just as likely to shoot deer relatively close as at longer ranges--the mule deer buck I killed a couple years ago with the PRC was only 159 yards away.
