Seating depth can also do this. If the bearing surface of the NBT's is different than the Vmax, you may have to tune seating depth. Amond my group of shooters, we call this "two grouping". I have a 308 that did this until I adjusted seating depth, and then it laid them all into a tight little covey of holes.
This. Also check a few bullets and verify weight. Had some of another brand that 4 in 10 would be 3.5-5 gn light out of the same lot. That looks very plausible looking at the target also. But most likely it's seating depth.