I have a Weatherby Vanguard in 308 that will shoot a clover leaf pattern @100 yards using Federal Premium 165 gr Sierra boat tails. My 16 y/o daughter uses the rifle and shoots inside an inch. If I try to use another brand with the same gr weight I don't shoot as tight. However my Winchester model 70 in 270 will group an inch with any 130 gr regardless of what brand??