just thought I would raise this ,like Lazarus, from the dead. I have an "old" model vaquero (I know, its just "vaquero") in .357, 4 3/4" barrel that I just cant get to shoot accurately after trying half a dozen loads/powders/projectiles, so thought I would do the slugging trick, pleasantly surprised, .357 pills push gently through the throats, but the bore mics at .3525 with 8 groove rifling (pistol is 1998 manufacture) just thought I would share my findings, keep yer powder dry.