As an example if you start the 100gr ballistic point at 3500fps the velocity at 100 yards will be 3230fps and at 500 yards it will be 2294fps.In other words it will lose 270fps over the first 100 yards and 1206fps over 500 yards.This data taken from the nosler reloading guide number four.
Obviously you did not understand what the tech was telling you.He should have provided a fps per inch of barrel figure and not a fps per yardage figure.