Remington core lokts are not hard on the pocketbook and have taken more big game than I could dream of. I personally reload, but I wouldn't hesitate to take core lokts out if I was after an elk. Just check em for accuracy... As you would anything else... 1" MOA should be sufficient for hunting... Or even 2" if you are only shooting out to 300 or so yards.
They have some in 140, 150 & 175 grain flavors for the 7mm rem mag. I'd shoot the 175s personally, but I know plenty of guys that have taken elk with the 140s in 7mm.
Good luck and stay safe!