Question I was recently told I could set my scope @ 25 yards 1" low and it should be on target @ or around 250 yds. I shoot 7mm mag encore with a Redfield 3x9 50. What is the proper way to set a scope? I would like to be around 200 yards @ target. Thanks
Answer It can be a little more involved than that. External ballistics (i.e. what happens after the bullet leaves the barrel) depend on the bullet mass, velocity, and shape. A scope sighting also depends on how high above the barrel the scope is mounted. Once you know the bullet mass (in grains), the ballistic coefficient (from the bullet shape), and the muzzle velocity, you can look up external ballistic tables online. Some tables also allow for normal mounting of the scope, or for see-through mounts (which are taller). Then there will be a distance shown for which you can adjust the scope, and the bullet drops at other distances are shown.
I have been an NRA certified rifle, pistol, and shotgun instructor for over 15 years. I was on the Temple University archery team, and was a pistol team captain at a gun club in Pennsylvania for 5 years. I have built muzzle loader handguns and rifles. I have used all of these weapons for hunting. I hunt North American big game, small game, and waterfowl. I can answer questions on hunting safety, getting started as a hunter, equipment and techniques for various types of hunting.
NC certified CCW instructor (concealed carry of weapons). Endowment member of the NRA, Life member of: NC rifle & pistol assoc., National Trapper's Association, and Grass Roots NC.