....and are made in many lengths. Some are like shotgun shells that will feed through an action and hold a smaller ga shell in them clear up to ones with a built in bbl ( for break opens) that use the extractor to work it's own built in extractor to remove the smaller cases. I don't use them because you have to check to make sure the wad doesn't become jammed in the bore from the privious shot.
I did buy some for flares , and one maker was kind enough to make me a few 10ga to 12ga adapters that were short chambered for flare rounds only so I could use the WW2 10ga Flare gun. You don't want to be able to chamber full rounds in those as that would then make them sawed off shotguns . But I can go 37MM to 25MM , 25MM to 12ga , 10ga to 12 ga , and 37MM to 12 ga by using the first two together.
Chris
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