Achieving high energy gain in laser fusion will require the use of moderately-thin pellet shells. But thinner shells areexpected to be more susceptible to break-up from the Rayleigh-Taylor instability. Calculations and experimental datathus far indicate that the growth rate of the Rayleigh-Taylor instability is reduced well below the classical value whenthe surface of the pellet shell is directly ablated by laser light. In addition, the "mix" of the cold DT shell with thehot ignitor may only slightly degrade the pellet yield. It may therefore be possible to successfully implode thesemoderately thin shells and produce gains of a few hundred, using a few-megajoule KrF laser driver.