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I guess you are thinking about using the same barrel for all cartridges of a given caliber; if not, you would need an adapter that had a length of barrel also, adding to the cost. If you used a chamber adapter, you would have problems with the gas getting into the crack between the front of the adapter and the barrel, eroding the crack and decreasing the life of the barrel and adapter.
There are chamber adapters, usually used to fire pistol cartridges in a rifle, but they seldom work very well and are not highly popular.
BTW, I assume you have a license to manufacture ammunition if you are doing it for others and charging for it.
Jim
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