[big al hunter]

You have a BDC reticle. It stands for bullet drop compensator. Sight the main cross hair to dead on at 100. Then shoot at 200, 250, 300. The top, center, or bottom of the circles under the main cross hair will be very close at these distances or further depending on your bullet weight. The key is shoot it at those distances to check it. The BDC only works at the power setting you sight in at (ie 4x. 6x) when you adjust the power setting it changes the size of the reticle in relation to the target. The BDC also gives you a built in range finder. The reticle is marked so you can calculate range based on the size of your game and the moa between the marks. Sounds complicated but you can buy a paper target and cut it to the size of your game animal. A deer average size from top of back to bottom of chest is 18 inches. Move the target to the distance you know and look through the scope. Write down or draw a picture showing how the reticle looks at 100, 200, 300, 400 yards. Remember this or tape it to your stock or binoculars. Now you know how far it is and which circle to hold on. Practice at those ranges and you will be able to do it quickly this hunting season