Editing Shell (projectile) (section)

===Range-enhancing technologies {{Anchor|RAP}}===
[[File:XM1113 in flight.jpg|thumb|upright=1.35|XM1113 extended-range artillery round, shown here at a range demonstration, uses a rocket-assist motor]]
Extended-range shells are sometimes used. Two primary types exist: [[rocket-assisted projectile]]s (RAP), which generate additional thrust via a rocket motor built into the base, and [[base bleed]] (BB), which reduce base drag by expelling gas into the low-pressure area behind the shell. These shell designs usually have reduced high-explosive filling to remain within the permitted mass for the projectile, and hence less lethality.