[JustPiper]

Thanks Soldier whatever it was shook our brick two-flat and was short, loud, no reprecussions

[ExSoldier]

short, loud, no reprecussions

By repercussions do you mean echoes or secondary explosions? It could have been a large caliber firearm; perhaps a .44 magnum or larger. Lack of echoes would indicate it was in an open area not near any buildings for the sound to bounce.