From sneak with a bow that does 366 points of damage.
(will take a photo of it and edit it in)
It's all just gear and perks ...with 100 archery.
I made some gear that had fortify blacksmithing on it (ring, gloves and ...I think ...hat) ...made fortify blacksmithing and enchanting potions ...bought additional potions from the alchemist.
Drank several different strengths of blacksmithing pots before improving the bow, then several enchanting pots before enchanting it.
I was in sneak with the perks for a damage multiplier from stealth (and all the perks in damage as well)
I also use enchantments on my gear that improve my ranged and one-handed damage.