Back a few years ago, I was working with the 180 NBT and 180 NAB in my .300 WM. I found the NBT to be slightly more accurate than the NAB in that setting.

In the 7RM, the 160 NAB is stellar, haven't tried the 150. My bud took his 7RM Sendero on an African PG hunt, was pleased with the rifle and the load, 160 NAB over 67.5 gr. RL-26 at around 3K fps. (Sendero is 26"). Mostly one shot kills, DRT or didn't go far. Fellow hunter borrowed it for a 300 yd. Impala shot. Boom, flop... PH was impressed with gun and load. Fellow hunters were, too.

DF