Bit of an update; I had access to the 300m line today to test my Marlin 30/30 with the new (extra long) Williams elevation screw. The difference between the 100m zero and 300m turned out to be a whopping 43 moa. So here'e the revised ballistic chart I came up with:
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A lot of drop, but once I found zero, she was really throwing them in there!
8/8 shots landed on paper, and the first 5 were within 6-7 inches of each other (with iron sights!). She opened up after the first 5 as I was rushing (and the front sight rattled loose again at some point; I really need to locktite that down again):
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And here's the finalized sights:
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And a pic of the re-finished forend:
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The forend section was sanded back to loosen up the rear barrel band. I then stained it with a Feast Watson Prooftint "Oak" stain (twice), followed by two coats of Feast Watson "Scandinavian Oil". The result as you can see is almost a perfect match. Loosening the rear band was a factor in obtaining that consistent 2moa accuracy.
Obviously a scope would be a lot more accurate, but that's just wrong on a lever-gun right? So who says a 30/30 is a 200yd rifle huh?