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If you are getting 2 inch groups at 100 yards with a Micro-Groove® barrel, I'd consider that outstanding (compared to what I've seen).
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flintlock .50,
Trust me the Micro-Groove barrel is not the problem unless you just got a bad barrel. I have one in .35 rem that is MOA on a good day with the right load and I know several other 336 owners personally who get great accuracy out of their Micro-Groove barrels.
The picture looks like either trying to shoot a bullet too heavy for the twist rate or there is severe damage to the rifling. No Micro-Groove in good condition without factory flaws would do that.
Could we see a pic looking down the bore?