Re: new guy to sight
You have some reasonable firearms there BUT the biggie is what scopes you have access to. Cheapest and slickest way to get into this is to get a Bushnell Elite 3200 fixed 10x Tactical - put it on the .280 and start to shoot a lot.
Good luck with your plans, there are lots of great guys who will steer you in the right direction.
Me, I would get a .308 Win. rifle as a training/learning tool. Heavy barrel Win, Rem. or Savage and shoot as much as I could afford the time and ammo.