I generally don't see shot drop at turkey ranges(under 50 yds.) What you will see is the pattern opening up and sometimes some holes developing. I start with my 40yd pattern and when I am satisfied I check my center of sight at twenty or under just to be certain . At close range using turkey chokes you don't have much room for error . You want to make sure if you get a close shot you won't be off to one side or high /low. Other than that , I've never found I had to compensate for any kind of pellet drop at reasonable ranges . If your pellets are maintaining lethal energy (velocity) at forty yds or even fifty, they won't be dropping yet . If you find yourself seeing patterns dropping you are probably exceeding the lethal range of the loads you are using.