The Leupold scopes are pretty good kit for basic hunting, but you will find that for true long range work repeatable turrets are a far better way to go. The precalculated reticles are not precise enough to count on, they can not adjust for changes in bullet, velocity, elevation or weather conditions.
Turrets are used to make far more precise adjustments than the 1/4 minute of deer that the precaculated retciles are capable of.
Personally a mildot is far too much math for me, why anyone would make a scope with milradian reticle and moa turrets escapes me.
I know it is likely more $$ than you planned for but take a look at Nightforces NXS scope line with MOA reticles, they are very user friendly and will last a lifetime without having to upgrade when you get bored with 500 yards.
The 300 is easily capable to 1000 yards and beyond and once the LR virus get ahold of you, 500 yards will be boring.
Long Distance is BETTER than being there