I'm probably not the best one to answer questions. My BC (and everyone else's I think) shot low due to the front sight being to high. You can order a replacement sight that is shorter, or if your cheap like me, you can cut the sight down and file new dove tails into it. Mine shot great with factory ammo but it costs too much so I got molds for mine. Can't tell you how its going to do cause the wind hasn't stopped blowing here for months (I guess a wind farm on each side of town should have been a hint). By all accounts, BC's like to eat larger cast bullets so 459's will probably work best for you. The sight apertures are just something you will have to try out until you decide what works best for you based on light and the type of shooting your doing. Enjoy.