RE: 220 Gr Bullet for 300WinMag
I know you asked about 220 grain but you may want to look at the 200 Grain Accubond bullet. It has an amazing BC of .588 and is built heavily enough to work up close and personal from a win mag without failing. The200 Grain Accubondwill provide down range trajectories equal to many 180s due the superior BC. Plug this BC into a Ballistics Calculator vs a 180 grain partition and you will be surprised at the trajectory and the big advantage in downrange energy.
PS: This bullet from a 300RUM grouped less than MOA for my buddy in a gun he was ready to trade in because he could not shoot 3 inche groupswith anything else.