Proprietary offerings of 2" shells in UK use card and felt wads with RTO closure.
This type of load configuration is more prone to pattern degradation due to inefficient obturation in longer chamber guns. If plastic wads are used in place of card+felt then there is less likelihood of gas "blow-by" however load data for the 2" hull utilising plastic wad and finishe with a crimp closure is pretty scant.
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