I just ordered .257 102 gr Controlled Chaos bullets to load for my 257 Roberts. None lead .257 bullets are hard to find, but these were available and they expand at a slightly less velocity than most bullets which is fine for the mild old Roberts. The Lehigh site has lots of load data for their bullets EXCEPT for .257. Can lead reloading data be used for copper bullets? Does anyone know if there is loading data for copper bullets on some other site. I am not finding much. Any help will be appreciated. Thanks, Grant.