John has an excellent sense (due to actual field experience) of the difference between the 250 NAB & 286 NP.

The supply of 250gr NAB's has dried up in my area while the 286's are available to a certain degree. The 250 NAB stretches the distance of the 9.3 a good amount and can be driven at ~2660 ft/s while the 286 NP will run 2500 +/- ft/s.

The 250 NAB makes the old 9.3 a 400+ yard capable round, with no down side.