In high-overload and high-speed electromagnetic railgun launch, the structural design of integrated launch component is particularly important. This paper performs dynamic simulation analyses on two connection structures and two projectile lengths of the integrated component, followed by corresponding dynamic launch tests. The experiments demonstrate that changing the bolt connection structure between the armature and the simulated projectile to an embedded connection structure increases the current capacity from 450 kA to 600 kA. Additionally, compared to the 150 mm projectile, the 200 mm projectile exhibits better stability in muzzle attitude. The simulation and test results provide important guidance for the design of integrated launch component in electromagnetic railgun systems.