BTW, I believe that an air gap between any obstruction and the mouth end of the loaded shell is much more destructive than something "right up tight" to that shell or "load".
Ramrods in muzzle loaders have been going down range for centuries now, mostly without damage. But cut a 3 inch section out of that ramrod, and place it about mid barrel, and you are almost assured to get at least a bulge.
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