Range
Don't recall what actual optimal/effective range values were in Open Beta, but with Sharpshooter skilled, you could put substantial damage on target at ranges two-to-three times present Optimal. On release of Uprising, the Sharpshooter skill was removed from the Shotgun's skilltree and its optimal range was reduced to 4.9 meters (where it has since remained).

Relative Damage
Chromosome HP values were substantially lower than present values (for all classes/frames). A single, well-placed breach shotgun blast back then dealt sufficient damage to drop well-fit MedFrame.

Actual Damage
At some point during mid Uprising, shotgun weapon proficiency was changed from +RoF to +Shield Damage.

Mechanics
Shotgun Hit Detection was bugged and patched several different times between release to mid Uprising. At its worst, a merc could stand directly atop an enemy hive, center his aim over the hive, fire the shotgun, and all twelve pellets would completely miss the hive. CCP eventually found corrected the underlying issue(s) with shotgun hit detection; it's HD has since been reliable.

Sound
Used to make more of a kickball-bouncing-on-pavement sound.