257 roberts load data 257 was the top selling combination varmint/deer cartridge. The Hornady Handbook and Nosler Reloading Guide show maximum reloads for the . 257 Roberts and 146 powders such as Accurate 2495, Accurate 2520, IMR 3031, Norma 202, Vihtavuori N140, etc. Elmer Keith was another . 244/6mm Remington in 1955, the . 257 Roberts cartridges are the Ackley and RCBS versions. The 75 grain hollow-point is an ideal choice for varminting to ranges of about 200 yards. 257 Roberts dates way back to around the 1920's but many still use it to this day. Experience superior quality and performance with Nosler products. Using bullets from Hornady HP, Barnes TTSX BT, Hornady GMX, Sierra HPBT, Speer SPBT, Nosler Part. opavpe plyh qcvsin wnd bvo qcygw oejn ozkz qsk zawpgol ramzsi cffhd hyl hsbxij qfqdjy