I take it you are referring to the Hornady "InterLock" bullets. 165gr should be okay for
Elk, but if you can stick with a 180gr. that would be better. As already noted, there are
others such as Federal Premium 180 using Nosler Partition, or the Trophy Bonded bullets.
These are also available in "High Energy" loadings, as well as standard.
I believe, there's also the Remington CoreLokt Ultra in 180gr.
You didn't mention what kind of accuracy you're getting with the 180's. Elk are big.
1-1/2" - 2" groups at 100yds will do. Anything better is just more icing on the cake.
Sight in approx. 2-1/2" high at 100yds. If at all possible, check your loads at a 300yd.
target. Every rifle is different, so the ballistic charts are only a rough guide. Practice some on breezy/windy days at 100, and 200yds. Learn to judge, and adjust for the breezes.

(note: formerly a Wyoming resident)