I have seen ground shrinkage and I have also seen ground "growage"!
I have been fortunate enough to take some DECENT bucks - I say decent because I have never taken a giant one before... I have never topped 125" in spite of the fact that most of my buddies have.
I do have fairly good "trigger control" too... I usually wait a good one out.
I have been disappointed a few times with bucks that I have shot but I have been absolutely delighted more times than I have been disappointed - it seems the longer I have hunted and the more control I have exercised, I find myself not shooting some of the smaller bucks and when I do shoot one and get over there to look at him... I often find he exceeds my original estimation.
Thus.... ground growage.
That is a new term I have coined and I am going to take the credit for it!
Having said that, the next time you harvest a buck that is bigger than you thought it was - make sure you tell your friends that it had some good old "South Carolina Ground Growage" to him.
That is, surely, better than ground shrinkage.