As stated, the loads for the Huntsman Manual dated 2/02 has these recommended loads. This came with my 2003 Huntsman. Also remember that there was only a 24" barrel in 2002 and 2003. Disregard the .45 caliber information, it never was released, and this load information should not be used with the old 70's era .45 caliber Huntsman.
The Sidekick Manual dated 4/04 has these recommended loads. Both my 2004 NEF Sidekick (7/8" breech plug, 24" barrel) and 2008 H&R Sidekick (5/8" breech plug, 26" barrel) use this same Manual.
I do not have a post 2/02 Huntsman Manual, so I do not know if they changed them as well as the Sidekick, but I have read before that they did. Just make sure, and if someone has a Huntsman manual dated after 2/02, please reply. The Sidekick was introduced in 2004 with 24" and 26" barrels. The 7/8" breech plug was used from 2002-2004, the 5/8" breech plug was introduced in 2005 in both the Huntsman and the Sidekick. Hope the additional information helps?