Yes they carry that mould. Expensive though. To quote from the 1998 dixie catalog.
"WHITWORTH BULLET MOULD: a .45 caliber, 575 grain, hexagonal mould that casts a 1 /38" elongated, hollow base bullet for precision long range shooting. Sir Joseph Whitworth invented the 1 turn in 20" rifling that used a hexagonal bullet in 1854. Today, an original mould is very rare and expensive. Our modern moulds are made by the well known English gunsmith Peter Dyson; beautiful work of high quality English design and materials. The ebony handles on the three pieces-mould with color casehardened cut-off lever, hollow-base forming tool and the top punch, all with beautifully turned brass ferrules, are of the finest workmanship. A bottle of Rapine Mould Prep is shipped with each Whitworth mould set.
CA8010 Whitworth Mould................$237.50