It does however love Federal's HE 180 grain NP load so I'm thinking I'll go to the Partition for home grown elk loads... Kimber recommends 165 grain and less bullets in the Montana due to the twist but my limited testing doesn't bear that out.
I hadn't run any 180 in my Montana til' tonight... went out to the range and printed a .470" group with 180 Partitions over 45 gr's of RL15 at 2,670 fps... I'm delighted since I have 450 qty. 180 gr. Partitions on hand