The smallest groups with my two 6.5 CMs are with 140gr Speers and Hornady's 41.5gr H4350 load. Consistent sub-moa, and one rifle is a 99 Savage.
Used the same bullet in the 6.5 Grendel ( Ruger American Bolt action) with a charge of 29 grains of W 748...
dropped a decent sized blacktail on the spot.... at about 125 yds, 2 seasons ago, when the rifle was new.