In the past 10 years, I’ve noticed a great amount of hunters using large magnum rifles and loosing alot of accuracy. Mostly because of recoil. Shot placement using smaller calibers is much better (270-300 mag.).
In the past 20 years in the field, believe me, a hunter that is accurate with his or her rifle with good shot placement at ranges of up to 350 yards, is much more efficient than a larger caliber with poor shot placement. Also, another thing to help your accuracy is to have a gunsmith adjust the trigger pull on your rifle to a 2-3 pound pull. Most factory triggers are 4-5 pounds plus and this makes shooting small groups at longer ranges very difficult. Also, please have your rifle shooting 3 inches high at 100 yards as this will put most calibers(270-300 mag) close to zero at 300 yards.
So, be familiar with your rifle, practice before your hunt, as this will produce a clean, 1 shot kill. If we lose respect for the animals we hunt, we are all in trouble.