The 6.5 Needmore with a 1:10 twist will need 130 gr. or less bullets. I'd say your #1 deer bullet would be the 120 gr. Nosler BT or 120 gr. Sierra SP GameKing (not GameChanger). Both these bullets are very soft, expand well and kill deer like crazy.
Heavier bullets like the 140 BT or 143 ELD-X(overly fragile) need 1:8 twists to stabilize better.
Good luck this year.