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.
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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.
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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?