Hey Robert,
2400 really isn't any better on your guns than H110...
2400 is a double based powder, meaning that it is both nitrocellulose and nitroglycerine. The nitroglycerine causes it to burn with a much hotter flame, which causes more erosion...
When you get right down to it, though, NONE of the slow-burning powders are really all that different in how they treat the gun steel.
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