How do I build this Firecracker Artillery Gun?

As a side note to this thread (shameless self promotion plug warning) there are not one, but two BP cannon barrels available in the yard sale here. We now return to the firecracker cannon thread.
 
M-98's are the same 1.4g size that everyone offers. I'm sure that's the max allowed in the U.S. I have multiple brands in the 1.4g size and they are all underpowered compared to what we have seen in the videos.
 
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