Rifle: CA Mesa w/22" barrel
Bullet: 140 gr. Nosler Partition
Powder: H4350 41.7 gr. 5 shot MV avg: 2,647 fps
Brass: Hornady
Primer Federal 210M
CBTO: 2.152"
COAL: ~2.790"
5 shot group avg: 0.674"
Likely can tighten the group ever so slightly, but as a hunting bullet, why?

It's you and the bullet, and all the rest is secondary.