The range and payload tradeoff in ramjet shells

What are the advantages and disadvantages of ramjet-assisted naval shells?

They promise greater range, but add complexity, reduce payload volume, and make errors more consequential.

The theoretical advantage is greater range for less propellant. A firing error would send the projectile farther off target as its reach increases. Ramjet machinery and fuel also consume shell volume, adding complexity and reducing the space available for a payload. Rocket-assisted projectiles provide a simpler comparison, including the suggestion that unused rocket fuel can contribute to the explosive effect. The later argument favors treating a ramjet shell as a kinetic-energy weapon whose impact supplies the destructive effect.