Hello world I am new here but I had some questions for anybody who is willing to help I recently got a Remington 700 and 300 win mag and I bought a bunch of ammo from different brands with different bullet weights the gun really likes the Barnes Vortx 180 grain tip TSX but when shooting at three and 400 yards my groups double in size at 100 yards and shoot a half inch at 400 yards it’s just about 8 inches but when I try what bullets with similar weight they don’t shoot as accurate as a copper bullets do this is my question to anybody who can help me understand this