Chris.
Nothing fancy as these dischargers were all based on some form of a .303 cal rifle from which the breech and small section of the rear end of the barrel were retained. There were no modifications done to the bore diameter. The Ballistite cartridges were designed with more than enough power to get the job done.
I suspect you might be thinking of blank firing adapters that are fitted to the muzzle of automatic weapons to permit a gas pressure buildup in the barrel of the weapon to enable the action to function properly. Trying that with a Ballistite cartridge would be outright dangerous.
David
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