I am not sure the data from my 28" Shilen 260 Rem will apply to your particular barrel. However my Ogive is 2.284" for 140gr Berger VLD Target #26401. Don't have OAL as I use ogive to seat my rounds. As you are probably aware Berger bullet accuracy can be had with considerable jump from the lands and jamming the lands is not always a requirement. My Alpha 1 mag is 2.920".