John,
I have gotten my M70 Featherweight 7x57 to shoot well enough with H4350, 215m and 140 TTSX following GG1 loads but for the life of me I can’t get some original 160 TBBC to shoot well or get to 2,700 fps with H4350. 46.0 gr H4350 produced 2,650 and not such good accuracy so I bumped up to 46.3 gr and switched to WLR primers and the velocity stayed about the same with 30-40 fps spreads. Any suggestions as to a different powder with that bullet? Thanks in advance.
