Dave Omanney - Rigby .470 NE.
Tony Seth-Smith - Rigby .470 NE.
Harry Selby started off his career carrying a Rigby .470 sidelock.
Ross Syfried has (or had-I'm not sure) a Rigby sidelock .577 NE - a rare beast!
Russ Aitken owned and used a rising-bite .470 NE for many years. It is now owned by a friend of mine. I know the rifle real well and have shot it many times.
Pete "Samaki" Salmon - Rigby .416.
David Blunt - Rigby .416.
Tony Sanchez-Arino - Rigby .416.
There must be many more.