Not having a shooting range to purchase paper zeroing targets I've found an easy way to make good zeroing targets. I use cereal boxes as the paper & mark off 1" tick marks, vertically, on both sides, from the top crease of the flap all the way to the bottom flap crease, & then to the same horizontally, on both top & bottom, & then I make a circle in the middle of the target, 1" in diameter, using a thick sharpie & then I mark lines connecting the tick marks. I then darken four squares that are one cubic inch away from the circle in the middle, & do that for all "quadrants". Then I take & darken the middle horizontal & vertical lines X & Y axis, to make the "reticle" lines for use with your scope.
I love this set up (same targeting paper AK Fish & Game range in Rabbit Creek has) As you can use this zeroing target @ 25 yds, & then again @ 100 yds, 200 yds etc.