The final spark was provided by the ammunition for the new Enfield Pattern 1853 rifled musket. These rifles, which fired Minié balls, had a tighter fit than the earlier muskets, and used paper cartridges that came pre-greased. To load the rifle, sepoys had to bite the cartridge open to release the powder. The grease used on these cartridges was rumoured to include tallow derived from beef, which would be offensive to Hindus, and lard derived from pork, which would be offensive to Muslims. At least one Company official pointed out the difficulties this might cause: