If you're DZ scope has the high mount in the rear which gives you the extra elevation then you shouldn't have to worry about being able to shoot to the maximum distance. Put your rifle in a padded vice or cradle and make sure it is plum up and down. Use a piece of tape or cardboard with a line on the wall and level it.  Do it some distance away from the rifle so that the line or tape is clear and you can adjust your crosshairs to match the line on the wall. If the crosshair is not level, there are two small screws on the second ring that you can loosen but don't take out and you can rotate that ring because it is connected to the cell that holds the cross hairs. When you get the cross hairs level then retighten the screws. Now take your rifle to the range and get it sighted in at 50 or 100 yards. If you've used up a lot of windage either right or left, there are two small allen head screws on both turrets. It takes a very small allen wrench to loosen those screws and then you can rotate the cylinder and line it up to zero which will give you equal windage on both sides. Then retighten so that they don't move on you. I like to set my scopes with a zero left and right and then the readings are just like using a Soule sight.

Old-Win has provided one of the best solutions for most scopes and mounts. You can scan countless catalogs with all kinds of devices that won't generally get you there any better and of course will run you some peso's. 

When I was a kid sweeping Sierra Bullet's shop floors after my paper route, Mr. Frank Snow who was the founder of Sierra and next door neighbor showed me the same procedure. I still use it and I've never owned a bore sighter. He are olso advised me to always adjust your turrets two clicks past then come back to your setting. This was for internal adjusting scope only. Not sure if you guys still do this. 

Rick