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The "old Vaquero" could handle "Ruger only" pressures, the "new Vaquero" can't.
Modern .45 Colts such as the Ruger BH and Vaquero are designed for .451" to .452" bullets, and bullets for .45 ACP can be used.
If you plan to use cast or swaged lead bullets, it's a good idea to measure the cylinder throats. Some owners have found them unsized, which can cause leading and inaccuracy. The best solution for that problem, if it exists, is to ream the throats to .4525".
As a hard core bullet caster, I measure both the bore and cylinder throats of every revolver I own, and size the cast bullets accordingly.
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