Assertion: gun's barrel | /r/HasProperty | with poorer gas-seal
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Source sentences:
text: Due to the hardness of the steel, steel BBs cannot "take" to rifled barrels, which is why they are undersized (4.4 mm ball against 4.5 mm bore) to allow them to be used in .177" rifled barrels, which when used in this configuration can in effect be considered smoothbore, but with a poorer gas-seal, and if 4.5 mm diameter BBs are used, they would jam in the bore.