I just purchased a first gen remington sendero in 300 win mag. I do not intend to hunt with the rifle but would like to get it set up to shoot paper and steel out to 500 yards. I know it is capable of much more but I do not have access to any place to shoot farther than that. I plan on loading RL22 with either the 180 grain accubonds I currently have or trying either 178 or 200 grain ELD-x bullets in it. It currently has a standard Leupold mount on it but no scope. I am trying to decide if a fixed 10x, 12x or higher magnification SWFA is the right choice or if I should be looking at something in the 18, 20 or 24 power range on the high end for more precise aiming. Also, I am not married to the Leupold mount on it so any mount/ring recommendations are welcome as well. Budget for scope would be $500-600 and I have no issue with a used optic. Thanks.