Are you talking a 7mm Rem Mag, 7mm 08, 7x57 Mauser? Either way for a big game rifle many hunters like to sight in at 2 to 3 inches high of center at 100 yrds. That allows you (depending on your bullet drop) a point-blank-range out to about 300 or more yards in that 7mm.
I shoot a 7mag for all my big game hunting. A Rem 700 with a 3-9 Leupold and 150 gr. Nos Ballistic Tips.. I zero 2-3 inches high @ 100 yards, gereally 3 inches high. Hold dead on your deer, elk, lope or what ever and DON"T HOLD OVER UNLESS ITS PAST 400 plus YARDS. The biggest mistake I see hunters do is misjudge distance and shoot over the animals back. How ever tempting put the first shot dead nuts on the animal. Realize that the kill zone of a deer is large and gives you some plus or minus in elevation by a few inches. Best of Luck.
Remember it's just A way, NOT THE WAY.
Have you thought about a trip out west for big game? Have you dreamed about what it might be like to ride horseback through the beautiful Rocky Mountains, while looking for deer or elk? Have you dreamed maybe of traveling to Canada for a moose, elk, bear or deer hunt? Have you wondered what it might be like to see the wild Alaskan bush?
Well, I have a little advice for those who have wondered those, or similar thoughts. JUST DO IT!! If you think you might enjoy it, my bet is that you...