Powder charges depends on the rifle your shooting and the projectile you load. Powder charges are also influenced by the kind of powder you shoot. The shooting circumstances also dictate the powder charge. If you're going to be shooting a heavy projectile over extreme long distances, then powder charge is important just as if the projectile is very light. We have to be able to deliver a certain amount of projectile energy down range as well as the accuracy to place the shot.

I think powder charge size also depends on the animal I am going to be hunting. I am not going after the large bear with a small charge and light projectile.

I agree with many, 80 grains of powder is plenty of juice to get most jobs done. I seldom shoot over 100 grains. On the target range the load can vary from 50-150 grains. All depends on the mood I am in and the other circumstances mentioned above....