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Ruger's stainless barrels (on revolvers, in particular) are considered to be some of the hardest barrels around. Once they are broken in, they tend to have a great bore surface.
If the test loads were developed in something else (such as the 7.5" Blackhawk), it could help explain the disparity in velocities.
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Don't even try it. It's even worse than the internet would lead you to believe.
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