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Reduction from .308 -> .22 LR (.22 Caliber MG Trainer) - General Ammunition Discussion - International Ammunition Association Web Forum
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Could the use of 'adapters' which fit into the chamber and swapping of the bolt, extractor and other parts allow firearms to use different calibers as long as the new cartridge is
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Chamber adapters for gallery shooting - General Ammunition Discussion - International Ammunition Association Web Forum
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