Re: scope base question
The amount of slope in the base you will need is largely dependent upon the amount of adjustment your scope offers.
You'll need 11-13 moa of elevation to get to 500 yds, so most any scope can do that with a flat base. Once you get further out it increses rapidly.
An old fixed power Super Sniper or fixed power leupy MK4 will have enough adjustment internally to get 1000+ without any slope, but many other scopes will need sloped bases to make it to 800.........