I've had great luck with .284 140's @3300fps on muleys
I'm very interested in how 180NAB's @ 3350fps via RUM will hold up on elk shoulders.....work good on paper
I love Accubonds, but personally, just me gabbing here, I'd run the 200-gn version from a RUM.
I run them from my 300 Win Mag and they are a wonderful bullet in every way- at least ballistically. Those things really cut the wind. Noticeably better than the 180 Ballistic Tip, which I believe should have similar flight ballistics to the 180 AB.
However, should you indeed poke a bull in the shoulder with that load, I will be very interested to hear how it works for you, and I wish you good luck in doing so!