I'm going on my first rifle elk hunt in October. I'm using a 300 win mag. The outfitter said the average shot is 250 to 350 yards, but I want to be prepared to shoot 400 yards at a 400 class elk . I've got a Zeiss Conquest 4.5-14x50 with a Zplex reticle which does not have any elavation or windage marks. I've also got a Nikon BDC 4.5-14x40 that does have the elavation circles under the crosshairs. The Zeiss is very clear and the Nikon has a thick cosshair. I'm wondering if I should get a different scope and do things right the first time. I'm 62 years old, so I don't have 20 years to experiment with scopes. Since its my first rifle hunt, is there a better scope I should get???