Ifyou want a 140 gr bulletI'd suggest the Barnes TSX. I use the 140 tsx in a 7mm rem mag, performed awesome on both elk and moose. In the .284 cal. I have also used Nosler part, AB, Hornady Interloc SP and Failsafes on elk/moose with good results. Other then a barnes I'd be looking to a150gr +premium bullet.

As mentioned prior pick the best accuracy and bullet for the job, IMHO the 160 AB is better suited then a 139 IB and would give up some to use it or equiv. Since it is the better grouper it makes the desicion a lot easier and will also help in weighing the results of your chrony testing.