RE: 7mm rem mag
At the distances that you state I would use a 140 gr. Nosler Partition. If you don't reload Federal has this load available. This will be flat shooting and the bullet will retain enough weight if you have to shoot close up. The 7MM Rem. Mag. is a wonderful caliber and most rifles chambered for this caliber have the ability to be very accurate. My step-father has a Ruger 77 Mk I and his with the aforementioned load is a 3/4" gun at 100 yards.