First Level Halfling Ranger
Wielding a sling-staff, 1d10 Damage normally.
1st Level Ancestry Feat: Titan Slinger – When attacking Large or larger creatures, upgrade sling damage dice 1 step (1d12)
For Hunter Edge choose Precision – The first time you deal damage to your Hunter’s Prey in a round, you deal 1d8 precision damage.
A 1st Level Halfling Ranger can do 1d12 + 1d8 + half Strength Mod to an Ogre…. With a rock.
At 2nd Level take the Rogue’s Devotion feat and at 4th take the Sneak Attacker Archetype feat.
Then at 4th Level you can do 1d12 + 1d8 + 1d4 if they are flat-footed + half Strength Mod to an Ogre…. With a rock.
And if you Critical Hit, you can do the math from there.