If by best you mean accurate then the same target ammo for close range....40grain bullet at 1050fps or so and then learn the wind reading from the grass and similar.......this is from reading other material and LIMITED longrange test of a couple of target type rifles in rimfire as pratice for similar centerfire gun......Lapua Midas L worked best in my guns but too expensive for much fun shooting.....again the drop wasn't much problem adjusting but the wind blows the bullet sideways very easy......One gun liked the CCI Green Tag almost as much as the Lapua.....HTH...good luck and good shooting!!