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Well I've posted all the details on the 12 Bore before , but to summarize the 12 bore is a top lever hammerless by Tolley 1896 , 3in most likely a 9Dram rifle , but no load data on the rifle , 1 in 80in twist , 24in barrels , 100 yard standing sight folding to 300 , almost 15lbs & semi visible rifling , actually the rifling is more than that it is rounded with sharp lands !
Is the twist 1 in 100 or 1 in 80 as above? There are no absolutes, but at almost 15 lbs and a twist faster than 1 in 100 or 120, we are leaning to the conical end of the spectrum according to my research. These guns were built to a weight to handle a given recoil level. 15 lbs is on the high side, so I would expect it was made for heavier slugs. For example, a 12 bore rifle with a 1 in 60" twist weighing 15 lbs would be a conical configuration.
Nice groups, since your sights start at 100 yards, I would conduct most of my testing at that distance. 50 yards should be childs play once you have the right combination, but if you find an average or even poor combination that works at 50, 100 yards will often disapoint. I, personally, do not like to be teased...
I will try and verify the twist rate in my Holland 12b rifle but as far as muzzle loading goes 1/32 is a conical twist and 1/72 for round ball. I think I have that right maybe Darrel can shed some light on the subject.
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Re: Some Info on ball mould size in 12 & 8 Bore ?