I've previously read elsewhere about how you should slug barrels of vintage Colts and Winchesters since bullet diameter requirements may often vary between similar models. However, am wondering if that should also be done for new production SAA's like the Uberti 1873 Cattleman revolver or even the new Colt SAA's? In looking at my Hornady reloading manual it lists jacketed bullets at .452 and lead at .454 diameter. Am curious why lead would be used with a larger diameter than jacketed when being shot through the same bore? Also would like to know if I should expect to purchase .454 diameter lead bullets for use in handloading for any of the new production SAA revolvers or should I expect to have to slug the barrel on my new Uberti SAA before buying lead bullets?