Suppose there are two explosive charges in a single casing. The detonation of the charges can be initiated either simultaneously (A) or in succession some milliseconds apart (B). Does A differ from B in respect to the overall explosive force? Can the shock front in B carry more energy in a certain direction? This question arose from my friend's statement that a successive detonation improves the effect of an explosion due to some kind of self amplification process, something that I doubt. Thank you in advance for your responses!