i have a new model vaquero in .357mag, nickle finish with a 4 5/8 in barrel ..
i shoot, .38 specials, very low power loads using 38 brass, 357 brass and i have even made some gallery loads with cut down 38 brass..
i shoot these quite a bit... i have zero cutting or damage in my cylinder throats or forcing cone area of my gun ..
you will need to clean the cylinder and barrel alot more, but for me, i have not had problems like you hear reported by some on this practice...
i also shoot full house .357 mag loads with this same gun, its still as accurate as ever ( more accurate then i am most times )