He joined Leicester Tigers in 1904 and played 183 times for the club over the next seven years. He also represented Cornwall 52 times and was capped for England thirteen times between 1905 and 1909. He also played against the touring South Africa team on their 1906 tour of Great Britain, and took part in the 1908 British Lions tour to New Zealand and Australia. Jackett was also a member of the Cornish rugby union team which, representing Great Britain, won the 1908 Olympic silver medal on 26 October 1908.