Source: https://github.com/liurui39660/PayDay2.Mod/tree/LongRangeRifleman

Farther the distance, higher the damage.
This mod gives the Rifleman Aced a new effect.
Put the decompressed folder to mods/, same as other mods.
Requires Localization Macro Replacement to properly render the in-game description.

In-game description
Aced: If you shoot at an enemy from 18m away, bonus damage exponential to the distance will be applied. It can only be triggered by sniper rifles and functions as simple damage.

Q: How to compute the bonus damage?
A: The bonus part is pow(damage, distance / 18) - damage,
where damage is the actual damage you deal towards the enemy after all the computation except for this skill,
and distance is the distance (unit: meter) to the target.

Q: What's the simple damage?
A: Just pure damage, similar to what Graze causes to nearby units. It does not count towards any weapon, also can't land a headshot.

Q: How will this mod affect sniper rifles?
A: It encourages players to snipe targets very far away, since the damage increases significantly with the distance.

Q: How about the original Rifleman Aced?
A: Most old upgrades except for the pistol zoom increase are removed.

Comments, suggestion and ideas for thumbnails are welcomed.