1865 Springfield

I don't know who to suggest in your state. 45-70 or 50-70 should be your choices to the best of my knowledge, 50 being more likely. A caliper measurement at the bore should point you in the right direction. You will need to craft some (actual) blackpowder and pure lead loads for it. Also you'll need to download approx 10% due to modern powder being a tad more energetic (per my research).
 
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