I currently am shooting a 270wsm with a Leupold scope that has the custom reticle in it. It is dialed in for 575 yards and is accurate. I am thinking of setting up a rifle for deer and elk that would be good to about 800 yards with a custom scope (reticle or turrets). My question is what caliber should I look at. I don't reload and don't want to pay the premium for the ultra mag shells. I was thinkin a 7mm remington or 300 winchester. Any thoughts. Thanks