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One limiting factor of the defensive shotgun is that one usually has only 6 rounds in the tube of a pump shotgun. Even with magazine extenders,...
For faster reloading when using a smoothbore muzzle-loading gun you can use paper cartridges. These cartridges are usually carried in a Belly Box....
More on paper cartridges on my blog here: http://woodsrunnersdiary.blogspot.com.au/search?q=paper+cartridges