you can buy a Tacomate A7 for just over a grand from Euro Optics.
If you go 270 WSM it depends what type of bullets you shoot, shorter ones would be a problem carrying down range due to low BC, bigger longer ones would be Ok. Either way you'd probably want to go with a Barnes.
Unless you are a LR nut I would say 450 yds, a 7 or 300 WSM might be a better option for elk, not due to range and drop but energy.