10 twist is plenty for the 150 grain bullets. If Moose is on the menu I would not consider anything lighter than 150 grain and would give the 160 grain (10 twist should be ok ) Partition a very hard look. I know Jack O'Conner used a 130 grain Partition on moose but I would prefer more bullet weight. H4831 usually gives good accuracy with max loads for me, just work up slowly.