Re: Leupold mounting advise
You will need 20 MOA to reach 1000 with that set-up (give or take a few clicks). Your scope has 15 MOA per rotation, so you will be in the vicinity of 850 yards with a single rotation. This is with a 200 yard zero ( a 300 yard zero won't quite get you there either). Your specific velocity and altitude will dictate what you actually need.
The scope has 90 MOA of total adjustment, so you should end up with enough "up" to get you to 1000 yards, but Remingtons sometimes zero closer to the upper end so a 20 MOA base might be a good idea. Theres no real drawbacks to using one.
I do a lot of dials for the 300 RUM w/VLDs and they are always within a few clicks up or down of 1000 with one rotation of our scope (20 MOA).
Medium rings should do the trick, but if you have a stock with a high comb, you may find that high rings line up your eye with the scope more naturally.