No, I don't. You've got gases expanding in all directions and yet gaps at the same time. And your nanosecond timing is hard to believe; this stuff happens in milliseconds, not nanoseconds. I do agree that pressures will reach higher levels than what a single charge would generate, but the effect of that is just going to be to accelerate the front ball faster. You're attempting to make a case for extreme conditions that, in my opinion, requires things don't move at all.