Re: Of Leupy M3 turrets and Mils.
They come with the scope.
I just sold a set of three which came with one I had which burned up in a fire.
Leupold can probably sell them to you.
I'd recommend that you save your money.
Memorize your dope in 100 yard increments from 200 to 600 yards. That dope is not going to change with conditions, unless you're shooting above 10,000 feet in altitude, and then it's not going to change very much.
That's 5 numbers, and only two of them have two digits.
Your dope from 700 to 1000 yards may change with conditions. Take those 4 numbers for the conditions you usually shoot in, write them on a small piece of paper, and tape them inside your rear scope cap, on the stock of the rifle, or somewhere else readily available when you're shooting.
Now you have the same information one of those turrets will have on it, and you've saved the money. Better still, you've memorized the ones you'll really need in a hurry, so you don't have to look them up.
If your scope has a mil reticle do this: Figure out your holdovers out to 600 yards from a hundred yard zero. Never dial at those distances. Hold using the reticle. Much faster.
If you don't know how to figure those holds, see
Calculating Holdovers and Holdunders.