What I do is find a premium bullet that expands in a controlled manner. I then work up 1 "pet" load that shoots that bullet extremely well. That's my 1 and only load for that rifle now. It'll usually be the only load shot out of that rifle and when using only 1 load/weight bullet you can memorize the trajectory easier. My choice of a bullet is the Nosler Accubond in 165gr weight. The 165 Accubonds will perform great on a elk or a deer. When using a good premium bonded (or solid copper) you can get by with a slightly lighter bullet such as the 165. Be aware that what shoots great in my A-bolt may shoot different in your rifle.