"In December 1797 parliament authorised the formation of a 5th battalion of the 60th regiment, to be recruited from European (mainly German) exiles familiar with the use of rifled weapons. In 1798 the Board ordered 5,000 rifled muskets from Prussia. It seems likely that the Hompesch Rifles initially used by the 5/60th were part of this batch. The Board were not very happy with the performance of these rifles: they had been designed primarily for hunting, they were excessively slow loading and they required cleaning every few shots. Also the rifles which were delivered were not of the same quality as the samples on which the order had been based. Indeed a significant portion were unusable, and from later reports it would appear that the batch contained rifles of differing bore - a major logistical problem on campaign. The board decided that they had better "do it themselves", particularly as Horse Guards were going ahead with the formation and training of a new, all British Rifle Corps." :
http://web.science.mq.edu.au/~susanlaw/ninetyfive/baker.htm