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You have to use a protective cup to keep from wrecking your barrel. The Ballistic products OB12 gas seal greatly improved my patterns. I will get you the numbers for the components.
I'm playing with a new .410 now but at some time during this turkey season will get the Knight TK out of the safe. Honestly the recoil was wearing me out but there are still a few muzzleloader only areas I would like to visit. I gave thought to using bulk TSS in place of the lead but never saw an official answer as to whether the the increased weight would be a safety issue. A 2 1/2" shot cup filled with TSS will weigh considerable more than the same shot cup filled with lead. Correct?? Even if ok I'm betting the recoil will increase with TSS. Eek! The usual lead may have to do.