Everyone is entitled to their own opinion on this subject. Personally, I tend to shoot 70 - 100 grains T7 fffg. I've always been able to find something that shoots well within this range. I have no problem with people who like to push the limits of what their muzzy's can do, but I'm not one of them. Now if I had a rifle that wouldn't shoot accurately with a lower powder charge, I would not be afraid to increase to 110 - 120 grains, but I have never needed to do this. I can see the advantages of a higher velocity, especially for long range shooting, but I prefer milder loads.
Some of the fastest kills I've made were using 80 grains of T7. It's all about shot placement and using good quality bullets.