Hello to everyone, I've been playing with some different loads for my 270WSM and noticed how large my ES's are using 140grn Accubonds and Magpro. I was trying to get into the 3200 fps range while keeping good accuracy and was unsuccesful. My groups are ~1.0 @ 3250, but they're constantly less than .5" @ 3065. My ES's have consistantly been 50-100 with this combo. Sometimes lower at the slower velocities. I then loaded up some 169.5grn Wildcat RBBT's with Retumbo and the same batch of prepped cases. My ES's were less than 10 and they shot pretty good (2 loads ~2/3MOA). I was suprised these shot so well with a 1-10 twist. My question is, What causes large ES's? Is it the powder? Rifle? Bullet? Combo of all? Does ES change with velocity nodes? Seating depths? Any info would be great. Thanks.