based on what I can see in the picture, its not a Speed Six, it's a Service Six.
The gun should be marked, on the right side, on the frame just below the cylinder.
The Security Six had adjustable sights, the Service Six had fixed sights, both had a square butt, the Speed Six was the Service Six with a round butt configuration.
The gun in the picture does have an uncommon feature, the Tyler T grip adapter was seldom seen on Rugers, but quite commonly applied to S&Ws by the users.
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All else being equal (and it almost never is) bigger bullets tend to work better.
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