I use the same bullet to hunt with year after year. I did switch from my TMZ to a Lehigh about a year and a half ago. I feel once that I have found a proven bullet, I don't like to try and fix something that isn't broke. I did go up in grain size on my Lehighs from 275 to 300, but other than that, If I adjust something it might be the powder? and that is even debateable.