Based on past forum discussions, I don't think we reached a consensus as to what shot charge Parker used. (...and, I think it varies with era, as in early guns may have been patterned with lighter loads, with 20th century guns having heavier shot charges.)
Either way, this old ammo had no plastic shot cups/wad columns, and probably featured soft shot & the "less than gentle" acceleration of black powder - all things that won't result in optimal patterns.
Long story short, my gun (patterened the same as the one in this discussion) is a nice skeet gun with "old fashioned" black powder loads, but it's a trap gun with the modern, efficient RST shells.
So, regardless of what choke percentage it shot like in 1885, the practical shooter would want to know what choke it shoots like today.
In your case, I'd say at least modified.
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