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And, that I should have the cylinder throats measured and the barrel slugged to determine a proper fit.
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It is easy to measure the cylinder throat, take your calipers and measure the outside diameter.
You can also take one of your .429 bullets and push it through the cylinder throat. Compare the resistance to a JHP.
After having done all of that, just ignore everything you "heard" about inaccurate Rugers, go load those bullets, and shoot the thing.
I shoot .429" bullets all the time in my 1982 SuperBlack hawk. It shoots fine.