The throat problem you're referring to is a common quality control issue with both the standard length Ruger Super Redhawk and the Toklat. I certainly have it on my SRH, cylinder throats running about .454 to .455 instead of .452. It means you won't get decent accuracy with factory projectiles nor will you get the expected velocities (due to blow by). Fortunately it isn't the case with all SRHs, but is common enough to be a known problem. I've seen emails from Ruger in which they claim that throats of that dimension are within their specified tolerances and as such they won't rectify them.
As with everything, you pay your money and take your chances. Its a pity because the SRH platform is near ideal for a DA hunting revolver, likewise the Toklat barrel length. If only Ruger respected their customers enough to ensure proper dimensional control.
Note: If you want to cast your own projectiles, then the above issues aren't as important because you can get moulds to suit. With oversized hard cast projectiles, my SRH will easily group 6 shots into less than an inch at 25 yards.