Easy way to zero. It's good for any rifle that you can look through the bore, and you need a rifle vise of some sort. I use it on bolt actions, single shots, and in-line ML's.
Set your target at 50 yds.
Lock the gun down, look through the bore and center the target as precisely as possible.
Adjust the x-hairs so that they are centered on the bulls eye.
Take the rifle out of the vise, shoot it on the bags, bipod, sticks, whatever you are using.
Fire one shot.
Lock the rifle back in the vise, center the x-hair on your original point of aim.
Use the adjustments to move the x-hair until it intersects the bullet hole from the first shot as precisely as possible.
Take the rifle out of the vise and fire another shot.
If you did it right, the the second shot should be dead center, or close to it, on the target. Sometimes you'll need a third shot to make a small adjustment to get it centered. Now you can fine tune at longer ranges, but with most centerfire rounds like the .270, .308, 30-06, and such, a 1" high zero at 50yds will put you 2" high at 100 with a drop of around 8" low at 300 yds. There are extremes depending on the round, but all of the flat shooting rounds hit within inches of each other out to 300 yds. Of course, you should shoot at various ranges to confirm your impacts (and your ability) at those ranges.
