ericrutters said:
was there ever a time in history that rifles such as my traditions deerhunter 50 flint or similar style rifles were produced /used
That's a complex question. Exact duplicates? Nah.
However ...
Barrel length has wandered all over the place during the black powder muzzleloader era. Short barrels, like 24-28 inches long, don't burn adequately powerful powder charges completely. Just shoot a 28 inch long barrel at night, the result is spectacular but wasteful. The, to my eyes, absurd 44 inch long barrels may have theoretically burnt powder charges more completely, but I feel fashion was the more likely reason for their use.
Were there "modern" stock dimensions, those designed specifically for open sights, in use in the past? Any good 18th century jaeger rifle has these, and maybe many 'English Style" rifles. Its just silly to look for the stock dimensions needed for a scope sight in even mid-19th century guns.
In summary, if you want a modern performing rifle, for open sights, made along traditional lines, go with a jaeger rifle.
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Warning on powder container - 'Always make sure no embers are smouldering in the barrel' So I ALWAYS blow down the barrel after each discharge.