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.
Here is a tip that was passed along to me - and I have not tried it yet - but it looks (and smells) like it will work fine! The gentleman that gave it to me regards it as his secret weapon and he is a VERY successful hunter.
Get a fresh tarsal gland off of a decent buck - I think the ranker, the better. Taking them off of bucks that are hot in the rut seem to be the best because that is when the glands are the darkest and have the most "male buck" scent...
Take that gland and put it in a good,...