[jmortimer]

"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"
That is some good advice if you own an "Old" Vaquero which will take "Ruger Only" loads. I have owned both "new" and Old" Vaqueros and the "new" Vaqueros can take 20K psi loads which is "+P" but not "Ruger Only" levels and the "new" Vaqueros have tight tolerances whereas the "old" Vaqueros are not so tight tolerance wise. I think the "new" Vaquero is perfect and the "old" Vaquero kicks a$$.