i use lead balls in my pietta 1858 but i might try conicals with different amounts of swiss 3fg charges to see if the group tightens up.
i do know of a member on here who did use conicals with triple 7 in his ruger and it was accurate, another club member who used to shoot revolvers to national standards before the pistol ban had a go with it too....he shot an even tighter group at 25 yds standing.
the revolver was accurate with ball as well