Assertion: rifle's barrel | /r/HasProperty | fouled with black powder residue
Facets:
value: after firing many shots
type: TEMPORAL
Source sentences:
text: The Minié ball was small enough in diameter that it could be loaded as quickly as a round ball, even with a barrel that had been fouled with black powder residue after firing many shots, and the expanding skirt of the Minié ball meant that it would still form a tight fit with the barrel and impart a good spin into the round when fired.