I have an older model Ruger 77 in 7X57 have tryed loading 130gr cast boolits not sure of the rate of twist of the barrel. But it was kind of like shooting a shot gun at the target.. they where all over.. It was recommend by a friend that I try a heaver bullet I tried some old 7mm 162 gr BT I had laying around after sighting in the last three where in the same hole at 50 yds. Anyone recommend a heavy 7mm boolit mould.. Thanks Jeff